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Home > Communication - CM/MZ > Email Delivery Failure Code Explanations
Email Delivery Failure Code Explanations
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Failure Categories


Delivery failures can occur for multiple reasons. Some failures result from conditions or issues that may be correctable.

Important: When Hard Bounce failures occur, remove undeliverable addresses from your distribution lists as soon as possible to avoid negative repercussions with the ISPs.

 

Failures are categorized as one of the following:

 

Category

Failure Type

Block

  1. - Spam Complaint
  2. - Blacklist
  3. - ISP Block
  4. - Content Filter
  5. - Spam URL
  6. - Excess Traffic
  7. - Security Violation / Virus
  8. - Technical Error Block
  9. - List Practices
  10. - Authentication
  11. - User-Initiated Block

Hard Bounce

  1. - Unknown User 
  2. - Bad Domain
  3. - Address Error
  4. - Closed Account

2999 - Other

Soft Bounce

  1. - Mailbox Full
  2. - Inactive/Disabled Account
  3. - Greylist
  4. - Server Too Busy

Technical

  1. - Data Format Error
  2. - Network Error
  3. - Other Receiver Error

4006 - Network Configuration

4999 - Other

Invalid

8001-8999. 

Note: A failure code of "0" indicates no failure occurred.

 

Block Failure Codes


The email has been intentionally refused by the receiving ISP or domain. Block failures are reported in the following error messages.

1001 - Spam Complaint

Email is being blocked because of receiving complaints that your email is unwanted (spam).

 

Likely Causes

Suggested Actions

  • Receiving server refuses the connection
  • Receiving server refuses to accept email during connection and returns it undelivered
  • The receiver has your email address on a blacklist
  • Spam complaints, bounce rates, and perceived bounce management

Examine the specific Failure Types to determine the likely causes. Based on the cause, perform the following actions:

  • Major ISP—Determine the cause, take corrective action, and seek to lift the block.
  • Secondary Domain—Determine incidence (percent blocked) and importance of a domain. If incidence and importance are high, contact the system administrator and company management.
  • Otherwise—Invalidate records after 3 to 5 attempts with the same result on subsequent mailings. Contact the recipient for a replacement (better) email address or flag for Address Recapture.

Low Engagement—Recipients may not be engaged with you (no/low opens or

clicks). Inactivity directly correlates to complaints.

  • Conduct separate reactivation mailings to inactive recipients. Purge non-respondents from your list.
  • Review your email sending cadence and reset it to be consistent with customer expectations and recall requirements.

High/Low Frequency—Recipients may be associating your email with spam if you're mailing too frequently or not frequently enough to prompt recall of permission.

Offer choice to recipients on both frequency and content.

Poor Relevance—Recipients may associate your email with spam if not targeted appropriately or if the content is not relevant to their preferences.

Tighten your targeting criteria and associate your content with preferences. Develop feedback mechanisms to confirm relevance.

 

 

1002 - Blacklist

Your email is being blocked because your domain name or IP address is on an external blacklist.

Note: There are hundreds of blacklists. Most have low penetration and no appreciable impact on your deliverability. However, multiple blacklists can negatively impact your reputation and indicate potentially serious email practice problems.

 

Likely Causes

Suggested Actions

Weak Branding—Recipients may not realize that the email is from you if your branding is weak.

Use consistent, prominent branding in your From Address, From Name, and Subject Line.

Weak Permission—Recipients may not associate your email with permission granted to you or a third party (list rental, affiliate programs).

  • Use more explicit methods to obtain and disclose permission (unchecked box, confirmation notice).
  • Investigate permission practices of affiliates.
  • Confirm consent before incorporating third-party names into your list.
  • Use more explicit methods to obtain and disclose permission (unchecked box, confirmation notice).
  • Investigate permission practices of affiliates.
  • Confirm consent before incorporating third-party names into your list.
  • Make prominent permission statements to remind recipients why they're getting your email.
  • Reconfirm permission and/or track other indicators of sustained interest (response, purchase).

Inadequate Complaint

Management—You may not be

unsubscribing recipients who previously complained or addressing the underlying causes of their complaints.

  • Immediately unsubscribe recipients who complain that your messages are spam.
  • Act on abusive mail and spam forum issues in a timely manner.
  • Establish whitelisting and feedback loops with ISPs, if available.
  • Monitor the nature of complaints received and investigate recurring problems.

High Spam Complaints—Your email may be generating a high rate of spam complaints.

1001 - Spam Complaint

  • Know your data sources. Investigate their compilation and management practices. Confirm consent before incorporating third-party names into your list.
  • Immediately unsubscribe recipients who complain that your messages are spam.

Spam Trap Hits—Your email may have been caught in spam traps used to identify spammers.

Blacklist Remediation—Contact the blacklist owner to request removal. This can be difficult and is not always productive.

Before making contact:

Address the underlying causes Determine the incidence (percent blocked)

Inadequate Complaint

Management—You may not be

unsubscribing recipients who previously complained or addressing the underlying causes of their complaints.

  • Immediately unsubscribe recipients who complain that your messages are spam.
  • Act on abusive mail and spam forum issues in a timely manner.
  • Establish whitelisting and feedback loops with ISPs, if available.
  • Monitor the nature of complaints received and investigate recurring problems.

1003 - ISP Block

Your email is being blocked because your domain name or IP address is on an ISP internal blacklist.

1004    Content Filter

Your email is being blocked because some aspect of your email content has triggered a spam filter.

Note: There are hundreds of spam filters. Most have low penetration and no appreciable impact on your deliverability. Others may have a broader impact depending on the usage of the domains on your list.

 

Likely Causes

Suggested Actions

High Spam Complaints—Your email may be generating a high rate of spam complaints.

  • See 1001 - Spam Complaint for suggested actions.
  • Know your data sources. Investigate their compilation and management practices. Confirm consent before incorporating third-party names into your list.
  • Immediately unsubscribe recipients who complain that your messages are spam.

Poor List Management—Your email may be generating high failure rates that are associated with spam or poor list management practices.

Your email may be blocked because of domain-specific policies (no commercial email), resource constraints, etc.

  • Contact your ISP for information on their blocking policies.

Your email may have triggered a spam filter due to:

  • Prohibited words or phrases
  • Too many HTML tags
  • Too many images.
  • Too many different font styles, sizes, or colors.
  • Content Scoring
  • Content Review—Based on the content score, reexamine your email templates, adjusting the language, style, and HTML as much as possible without sacrificing effectiveness.

1005 - Spam URL

Your email is being blocked because one or more of the URLs in your email is associated with spam complaints.

 

Likely Causes

Suggested Actions

Poor URL Usage—URLs are being used too broadly. The practices of affiliates or others may be impacting your reputation.

  • Segregate your URLs. Use distinct URLs for each class of mail (transactional, commercial, newsletter, etc.).
  • Verify URL is not being used in other emails perceived as spam (other divisions, affiliates). Investigate the underlying cause of problem URLs.

Low Engagement—Recipients may not be engaged with you (no/low opens or clicks). Inactivity directly correlates to complaints.

  • Conduct separate reactivation mailings to inactive recipients. Purge non-respondents from your list.
  • Review your email sending cadence and reset it to be consistent with customer expectations and recall requirements.

High/Low Frequency—Recipients may be associating your email with spam if you're mailing too frequently or not frequently enough to prompt recall of permission.

  • Review your email sending cadence and reset it to be consistent with customer expectations and recall requirements.
  • Offer choice to recipients on both frequency and content.

Poor Relevance—Recipients may associate your email with spam if not targeted appropriately or if the content is not relevant to their preferences.

  • Tighten your targeting criteria and associate your content with preferences.
  • Develop feedback mechanisms to confirm relevance.

Weak Permission—Recipients may not associate your email with permission granted to you or a third party (list rental, affiliate programs).

  • Use more explicit methods to obtain and disclose permission (unchecked box, confirmation notice).
  • Investigate permission practices of affiliates.
  • Confirm consent before incorporating third-party names into your list.
  • Use more explicit methods to obtain and disclose permission (unchecked box, confirmation notice).

1006    Excess Traffic

Your email volume is exceeding the receiving mail server's limits or capacity.

 

Likely Causes

Suggested Actions

 

  • Investigate permission practices of affiliates.
  • Confirm consent before incorporating third-party names into your list.
  • Make prominent permission statements to remind recipients why they're getting your email.
  • Reconfirm permission and/or track other indicators of sustained interest (response, purchase).

Weak Branding—Recipients may not realize that the email is from you if your branding is weak.

  • Use consistent, prominent branding in your From Address, From Name, and Subject Line.

Inadequate Complaint

Management—You may not be unsubscribing recipients who previously complained or addressing the underlying causes of their complaints.

  • Immediately unsubscribe recipients who complain that your messages are spam.
  • Act on abusive mail and spam forum issues in a timely manner.
  • Establish whitelisting and feedback loops with ISPs, if available.
  • Monitor the nature of complaints received and investigate recurring problems.

Sending Too Much, Too Fast—You may be exceeding the receiving domain's traffic thresholds. Sending too much/too fast is associated with spamming and can result in temporary or permanent blocks.

  • Apply domain controls to the receiver mail server (speed throttling, connection limits).
  • Retry or resend later and monitor acceptance.

1007 - Security Violation / Virus

Your email is being blocked because of a security policy violation.

 

1008 - Technical Error Block

Likely Causes

Suggested Actions

Sender Identity Problem—Your identifying information can't be verified (reverse DNS or valid From and Reply To addresses).

Double-check your DNS entries. Validate your From and Reply To addresses to be sure they actually exist.

Virus Infection—A virus has been detected in your email message or attachment.

Double-check that your mail systems are not infected with viruses or worms. Some may attach themselves maliciously to outbound emails.

Excess Volume—Your cumulative daily volume exceeds
 the number of emails allowed. (Some smaller domains have an inbound volume to protect their servers from Spam.)

Determine incidence (percent block) and importance of a domain. If warranted, spread volume over multiple days.

1009 - List Practices

Your email is being blocked because Unknown User failures have reached an unacceptably high level.

Likely Causes

Suggested Actions

Stale Data—At 33% address churn per year, your list may contain a high number of undeliverable records if it hasn't been recently mailed or if too much time has elapsed between data capture and mailing.

  • While mail frequency should be adjusted for customer preference and value, all segments of your list on a regular basis to ensure brand visibility, continuity of communication and address deliverability.
  • Set standards for the first communication after data capture (5 to 10 days). This action will also reduce the likelihood of complaints.
  • If mailing to an “old” segment, do a test before full deployment. Deploy the mailing slowly to avoid spikes in Unknown User failures.

Poor Data Capture—You may not be

adequately validating email addresses at the point of data capture.

  • Send a follow-up email to new customers to confirm opt-in
 permission and validate the deliverability of the address provided. If the email bounces, invalidate and contact the customer for a new/corrected address.
  • Require double entry of email addresses to minimize typographical errors.

Unreliable Data Source—You may be introducing undeliverable records to your list because of unreliable data sources (list rental, affiliate, etc.). A high incidence of stale, inaccurate, or fictitious data suggests a problem.

  • Know your data sources. Investigate their data compilation and management practices.
  • Confirm consent and deliverability before incorporating third-party names into your list.

Failure to Invalidate—You may not have invalidated previously identified Unknown User failures and removed them from your list.

  • Verify that UnknownUser failures have been properly invalidated and removed from your list. If not, immediately do so.

 

Note: UnknownUser status indicates the email address is valid for the domain but nonexistent. Generally, this means the account has been closed for some time.

UnknownUser failures are associated with spamming (dictionary attacks) and are the most “toxic” type of failure for legitimate mailers. A high incidence typically indicates list management problems.

1010 - Authentication

Authentication prevents unauthorized people from forging your email address or domains. Senders publish a record identifying the servers authorized to send an email for a domain. Upon the receipt of the email, the receiving domain checks the record against data in the email header to be sure that the sending server (IP address) and domain name match.

Note: You must change settings in your email program and DNS servers or the receiving email system may mistake you for an unauthorized sender.

 

Likely Causes

Suggested Actions

  • Your identifying information cannot be verified via an SPF or Sender-ID record because of a bad record or no record at all.
  • Your DomainKeys signature has not been properly configured in your email and DNS servers or is not configured at all.
  • If you did not send the message, then someone tried to send an email pretending to be from you and the message was rejected before anyone saw it.

If you are the system administrator for the domain in question, check to make sure that the authentication record for that domain lists the particular server as authorized to send an email on its behalf. If you need help setting up an authentication record, contact support.

1011 - User Initiated Block

You have caused all messages to the domain(s) not to be sent or discarded by setting a user-initiated directive.

1999 - Other

Your email has failed for other block reasons that are typically low incidence.

 

Likely Causes

Suggested Actions

Stale Data—Your list may contain “dead domains” if it hasn't been recently mailed.

  • If you suppressed a domain due to it being a “dead domain”, upon notification, invalidate records immediately and remove them from your list.
  • Contact the recipient for a replacement or corrected email address or flag for Address Recapture.

ISP Block or Other Technical Issues—Your email has been intentionally refused by the receiving ISP or domain, or you are experiencing technical difficulties.

  • If you flushed a domain due to blocking issues, determine the cause, take corrective action, and seek to lift the block.
  • If you flushed a domain due to an underlying technical problem, determine the cause, take corrective action, and retry or resend and monitor acceptance.

 

Hard Bounce Failure Codes


Your email is permanently undeliverable due to address or domain errors or status. Hard Bounce failures are reported in the following error messages. Click on the failure code to see specific details on analyzing a specific failure:

2001 - Unknown User

Your email address is valid for the domain, but nonexistent. Generally, this means the account has been closed for some time.

Note: Unknown User failures are associated with spamming (dictionary attacks) and are the most “toxic” type of failure for legitimate mailers. A high incidence typically indicates list management problems.

 

Likely Causes

Suggested Actions

Hard Bounces occur for multiple

reasons, such as address errors, bad domain name names, unknown users, and closed accounts.

Examine the specific Failure Types to determine the likely causes. Based on the cause, perform the following actions:

  • Major ISP—Upon notification, invalidate records immediately and remove them from your list. Contact the recipient for a replacement or corrected email address or flag for Address Recapture.
  • Secondary Domain—Invalidate records after no more than 2 to 3 attempts with the same result on subsequent mailings. Contact the recipient for a replacement or corrected email address or flag for Address Recapture.

Stale Data—At 33% address churn per year, your list may contain a high number of undeliverable records if it hasn't been recently mailed or if too much time has elapsed between data capture and mailing.

  • While mail frequency should be adjusted for customer preference and value, all segments of your list on a regular basis to ensure brand visibility, continuity of communication, and address deliverability.
  • Set standards for the first communication after data capture (5 to 10 days) to reduce the likelihood of complaint.
  • If mailing to an “old” segment, do a test before full deployment. Deploy the mailing slowly to avoid spikes in Unknown User failures.

Poor Data Capture—You may not be

adequately validating email addresses at the point of data capture.

Send a follow-up email to new customers to confirm opt-in
 permission and validate the deliverability of the address provided. If email

2002 - Bad Domain

Your email has a domain name that's invalid or no longer exists.

 

Likely Causes

Suggested Actions

Unreliable Data Source—You may be

introducing undeliverable records to your list because of unreliable data sources (list rental, affiliate, etc.). A high incidence of stale, inaccurate or fictitious data suggests a problem.

  • Know your data sources. Investigate their data compilation and management practices. Confirm consent and deliverability before incorporating third-party names into your list.
  • Restore Communication—Contact the recipient for a replacement email address or flag for Address Recapture.

Stale Data—Your list may contain “dead domains” if it hasn't been recently mailed.

  • While mail frequency should be adjusted for customer preference and value, all segments of your list on a regular basis to ensure brand visibility, continuity of communication and address deliverability.
  • If mailing to an “old” segment, do a test before full deployment. Deploy the mailing slowly to avoid spikes in failures.

Poor Data Capture—You may not be

adequately validating email addresses at the point of data capture.

  • Send a follow-up email to new customers to confirm opt-in
 permission and validate the deliverability of the address provided. If the email bounces, invalidate and contact the customer for a new/corrected address.
  • Require double entry of email addresses to minimize typographical errors.
  • Perform Address Correction (hygiene) to correct common misspellings on major domains before adding large quantities of new records to your list. Send confirmation email on corrected records.

2003 - Address Error

Your email address has a format or syntax error (multiple or missing @ sign).

 

Likely Causes

Suggested Actions

Unreliable Data Source—You may be

introducing undeliverable records to your list because of unreliable data sources (list rental, affiliate, etc.). A high incidence of stale, inaccurate or fictitious data suggests a problem.

  • Know your data sources. Investigate their data compilation and management practices. Confirm consent and deliverability before incorporating third-party names into your list.
  • Restore Communication—Contact the recipient for a replacement email address or flag for Address Recapture.
  • Contact the recipient for a replacement or corrected email address or flag for Address Recapture.

Poor Data Capture—You may not be

adequately validating email addresses at the point of data capture.

  • Send a follow-up email to new customers to confirm opt-in
 permission and validate the deliverability of the address provided. If the email bounces, invalidate and contact the customer for a new/corrected address.
  • Require double entry of email addresses to minimize typographical errors.
  • Perform Address Correction (hygiene) to correct common misspellings on major domains before adding large quantities of new records to your list. Send confirmation email on corrected records.

Unreliable Data Source—You may be

introducing undeliverable records to your list because of unreliable data sources (list rental, affiliate, etc.). A high incidence of stale, inaccurate, or fictitious data suggests a problem.

  • Know your data sources. Investigate their data compilation and management practices. Confirm consent and deliverability before incorporating third-party names into your list.
  • Restore Communication—Contact the recipient for a replacement email address or flag for Address Recapture.


2004 - Closed Account

Your email address is valid for the domain but is now closed or suspended.

 

Likely Causes

Suggested Actions

Email Address Change—At 33% address churn per year, closed accounts is a major cause of list attrition.

  • Given the rate of address churn, customer reactivation should be a key component of any email communication program.
  • Request a second/backup email address or a new/better one as a standard part of your data capture and ongoing communications.
  • Contact the recipient for a replacement email address if now closed.
  • Flag for Address Recapture (eCOA, email append, etc.). To maximize success, link email addresses to offline data (name, postal).

Stale Data—Your list may contain a high number of closed accounts if it hasn't been recently mailed or if too much time has elapsed between data capture and mailing.

  • While mail frequency should be adjusted for customer preference and value, all segments of your list on a regular basis to ensure brand visibility, continuity of communication and address deliverability.
  • If mailing to an “old” segment, do a test before full deployment. Deploy the mailing slowly to avoid spikes in failures.

Unreliable Data Source—You may be introducing undeliverable records to your list because of unreliable data sources (list rental, affiliate, etc.). A high incidence of stale, inaccurate, or fictitious data suggests a problem.

  • Know your data sources. Investigate their data compilation and management practices. Confirm consent and deliverability before incorporating third-party names into your list.
  • Restore Communication—Contact the recipient for a replacement email address or flag for Address Recapture.

 

 

Soft Bounce Failure Codes


Your email is temporarily undeliverable due to mailbox status, etc.

 

Likely Causes

Suggested Actions

Soft Bounces occur for multiple reasons, including mailbox over-limit conditions and inactive accounts.

Examine the specific Failure Types to determine the likely causes. Based on the cause, perform the following actions:

  • Resend records that fail for temporary conditions.
  • Invalidate records only if the same result is received on subsequent mailings over at least 30 days.
  • Contact the recipient for a replacement or corrected email address or flag for Address Recapture.

 

 

Soft Bounce Processing

Whenever the system interprets a failure as temporary, then the email is deferred and the system will re-attempt delivery based on the Message Manager settings. By default, the system attempts to deliver as follows:

Assume the Initial Retry Interval = 900 seconds (15 minutes) and Deferred Message Expiration Time = 14400 seconds (4 hours).

The EDS places an email in the deferred queue.

  1. After 15 minutes, the EDS attempts to deliver the email. The EDS will attempt to deliver the email 3 times (based on the MaxDeliveryAttempts setting in domain limits) before deferring again.
  2. If that delivery attempt fails, the EDS doubles the time of the last wait period. So, after 30 minutes, the EDS re-attempts delivery. The EDS will attempt to deliver the email 3 times (based on the MaxDeliveryAttempts setting in domain limits) before deferring again.
  3. If that delivery attempt fails, the EDS doubles the time of the last wait period. So, after 60 minutes, the EDS re-attempts delivery. The EDS will attempt to deliver the email 3 times (based on the MaxDeliveryAttempts setting in domain limits) before deferring again.
  4. If that delivery attempt fails, the EDS doubles the time of the last wait period. So, after 120 minutes, the EDS re-attempts delivery. The EDS will attempt to deliver the email 3 times (based on the MaxDeliveryAttempts setting in domain limits) before deferring again.
  5. If the final delivery attempt fails, the EDS doubles the time of the last wait period. to 240 minutes before issuing a failure message.

With the default settings, the system attempts to deliver the message four times. If the expiration time is reached without successful delivery, then the EDS marks the message as FAILED and adds the information to the defer-failed log.

3001 - Mailbox Full

Your recipient's mailbox is full or has exceeded its allowed storage.

3002 - Inactive/Disabled Account

Your recipient's email account is inactive or temporarily disabled.

 

Likely Causes

Suggested Actions

Temporary Condition—The recipient may have received an unusually high email volume or has not checked his account for a while (vacation, travel).

Resend and monitor acceptance

Infrequent Use—A full mailbox may signify that you're mailing to one of the user's less important email accounts.

Consider Full Mailbox failures as a warning sign. Request a second/backup email address or a new/better one. Attempt contact with the customer through alternate means.

Address Change—The recipient may have abandoned this email address. Watch for it to appear as a Hard

Bounce/Closed in future mailings.

Contact the recipient for a replacement email address if reported as Closed in subsequent mailings. Flag for Address Recapture (eCOA, email append, etc.).

Delinquency or Dispute—The recipient may not have paid the subscription fee or is involved in a dispute with the ISP.

Resend and monitor acceptance

Temporary Condition—The recipient may have received an unusually high email volume or has not checked his account for a while (vacation, travel).

Resend and monitor acceptance

Infrequent Use—A full mailbox may signify that you're mailing to one of the user's less important email accounts.

Consider Full Mailbox failures as a warning sign. Request a second/backup email address or a new/better one. Attempt contact with the customer through alternate means.

Address Change—The recipient may have abandoned this email address. Watch for it to appear as a Hard

Bounce/Closed in future mailings.

Contact the recipient for a replacement email address if reported as Closed in subsequent mailings. Flag for Address Recapture (eCOA, email append, etc.).

 

3003 - Greylist

Your email is being greylisted, a type of temporary block to combat spam.

3004 - Server Too Busy

Your email can't be accepted because the receiving mail server is temporarily overwhelmed with delivery attempts.

Note: The receiving domain is not refusing your email. You're being tested to see whether you will retry delivery. Spammers will not.

 

Likely Causes

Suggested Actions

Greylisting—This is a technique used by smaller ISPs and corporate domains.

  • Resend and monitor acceptance

High Traffic—The receiving mail server is overwhelmed with traffic.

  • Apply domain controls to the receiver mail server until traffic subsides (speed throttling, connection limits).
  • Retry or resend later and monitor acceptance.

3999 - Other

Your email has failed for other soft bounce reasons that are typically low in incidence.

 

Technical Failure Codes


The email to this address or domain cannot be delivered because of technical difficulties. Technical failures occurred during the attempt to connect with a receiving server.

4002 - Data Format Error

Your email is being rejected because of formatting issues.

 

Likely Causes

Suggested Actions

Technical failures occur for multiple reasons, including server down or overload conditions and network or DNS errors.

Examine the specific Failure Types to determine the likely causes. Based on the cause, perform the following actions:

  • Resolve underlying technical problem and resend records.
  • Invalidate records only if the same result is received on subsequent mailings over at least 30 days.
  • Contact the recipient for replacement or corrected email address or flag for Address Recapture.

 

Lengthy Subject Line—Your Subject Line may violate the receiving domain's length restrictions.

  • Shorten the message or, if attachments are included, try removing them. Retry delivery later.

Prohibited Characters—Your message may contain prohibited formatting or characters. Smaller domains may not accept foreign language characters.

  • Review From, Subject and message content itself for any unusual formatting or characters, retry delivery.

Invalid Headers—The headers in your mail may be incorrectly formatted.

  • Review From, Subject and message content itself for any unusual formatting or characters, retry delivery.

 

4003 - Network Error

Your connection to the receiving mail server was lost during delivery.

4004 - Other Receiver Error

Your connection to the receiving mail server timed out.

 

Likely Causes

Suggested Actions

Server Down—The receiving mail server may have gone down or timed out.

Double-check that your Internet connection is working and stable. Retry or resend and monitor acceptance.

Routing Issues.—There may be routing issues between you and the receiving mail server

Double-check that your Internet connection is working and stable. Retry or resend and monitor acceptance.

DNS Error—DNS may not be configured properly on your mail server or in your network.

Make sure you're polling a valid DNS server for domain names. Make sure your mail server can poll receivers' DNS servers.

Internal Network Error—You may be experiencing on-premises network issues.

Check your physical Internet connection to your mail servers. Check to make sure you have enough bandwidth allocated to your server.

External Network Error—Your Internet Service Provider may be experiencing intermittent connectivity issues.

Check your ISP connection. Make sure it's working properly. Check for bandwidth latency issues to the Internet.

4006 - Network Configuration Error

Your email has failed because of a problem in your configuration files or network setup.

 

Likely Causes

Suggested Actions

Configuration Error—Your network configuration files have not been properly set-up or formatted correctly.

Check configuration files for intended set- up, proper formatting, mistakes, or illegal characters.

Virtual Server Error—There was an misconfiguration in your virtual server configuration files

Check your virtual server(s) configuration to make ensure they have the proper access from your network and intended set-up.

Physical Network Error—There is an issue with the network the system is attached to.

  • Check your ISP connection. Make sure it’s working properly.
  • Check for bandwidth latency issues to the Internet or your internal systems.

4999 - Other

Your email has failed for other technical reasons that are typically low incidence.

 

Likely Causes

Suggested Actions

 

Ensure that the configuration you set-up will

work with the system set-up you have.

 

Invalid Failure Codes


The recipient’s email address is invalid.

 

Failure

Code

Message

Description

8001

Missing '@'

The email address is missing the @ sign.

8002

';' present

The email address includes a semicolon. Semi-colons are not allowed in email addresses.

8003

Multiple '@'

The email address has multiple @ signs.

8004

Presence of '.' before '@'

The email address has a period right before the @ sign. This format is not supported.

8005

Presence of '.' after '@'

The email address has a period right after the @ sign. This format is not supported.

8006

Presence of consecutive '.'

The email address has consecutive periods, which is an unsupported email address format.

8007

>< not closed

Email addresses may include the < and > signs to indicate a friendly name. This reason indicates that the email address

does not use these symbols appropriately.

8013

INVALID EMAILID FORMAT - '\' Present for TO recipient

The recipient's email address includes a backslash. Backslashes are not allowed.

8015

INVALID EMAILID FORMAT - ' '

Present for TO recipient

The recipient's email address includes a space ( ). Spaces are not allowed.

8998

INVALID EMAILID FORMAT -

Length exceeds 255 characters

for TO recipient

The recipient's email address is too long. Email addresses must be less than or equal to 255 characters.

8999

Other invalid format

The email address is invalid for another reason. Please check the email address format.

 

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