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Bounce categories and reasons for Marketing Cloud email sends

Дата публикации: Jan 17, 2025
Описание

Mailbox providers exist to support their users. This not only means getting mail to its recipients, but also keeping unwanted mail out. Senders must ensure that mail is compliant with authentication standards and respects user preferences. Some bounces are uncontrollable - like those that occur when mailboxes or full or a network is unreachable. But bounces can also result from misconfigured authentication, abrupt increases in volume, or poor reputation. Examining bounces helps senders ensure that avoidable problems are addressed early. To support this, Marketing Cloud categorizes bounces into bounce categories and subcategories. 

Bounces are placed in 4 broad categories:

  1. Block Bounces are logged because of a lack of authentication, unexpected volume, or when the domain or IP has poor reputation.
  2. Hard Bounces are logged due to permanent conditions such as when a user or domain does not exist.
  3. Soft Bounces are logged for temporary failures unrelated to sender configuration or reputation such as a full inbox, inactive account status, or temporary DNS failure.
  4. Technical Bounces are logged when the email server rejects the email the message fails due to technical reasons errors, like a failure to make a connection.

Bounces also have a BounceTypeID and there are 2 categories.

         BounceTypeID BounceTypeDescription
         1 delayed
         2 immediate

Use bounce category statistics to see trends in your sending health. When a new pattern of bounces emerges, retrieve samples of raw bounce messages to validate their categorization and see details shared by the mailbox provider. Use individual bounce responses in conjunction with the category recommendations below.

To learn more about bounce handling, see Bounce Mail Management in Email Studio and Bounces in Marketing Cloud.

 

Bounce CategoryBounce Category IDBounce Subcategory IDDescriptionReasonGuidance
Block bounce31001ComplaintsYour email is blocked due to complaints.Review postmaster data (GMail, Microsoft) and complaint data to identify problematic campaigns, sending domains, or IPs. Use this information to improve content and list hygiene. 
1002SpamblockedThe remote mail server has rejected this message due to characteristics of spam.Review postmaster data (GMail, Microsoft) and complaint data to identify problematic campaigns, sending domains, or IPs. Use this information to improve content and list hygiene. 
1004ContentMessage was filtered due to content.URLs or key words are potentially malicious. Review your content and test the removal of content until you reach the inbox and isolate the offending text/URL.
1005URL BlockEmails containing your URLs are blocked.URLs or key words are potentially malicious. Review your content and test the removal of content until you reach the inbox and isolate the offending text/URL.
1009High Unknown Address Pct.Email is blocked due to the high quantity or percentage of unknown or inactive addresses on your list.An abnormal volume of mail is bound for addresses that don't exist or are inactive. This suggests insufficient list hygiene policy. See: List Hygiene and Spam Filters and Blog: How To Keep Email Subscribers Engaged for Life
1010AuthenticationMessage lacks required authentication.If sending with an authenticated domain, log a case to validate configuration
1999OtherThis email has been blocked by recipient.If encountered while during the warming process, log a case for assistance
Hard bounce12001User UnknownAddress is non-existent at the domainThis address is unreachable. Learn how Marketing Cloud actively suppresses these records in future sends: Bounce Mail Management
2002Domain UnknownRecipient domain doesn't exist.This domain is unreachable. Learn how Marketing Cloud actively suppresses these records in future sends: Bounce Mail Management
2003Bad AddressSyntax Email address in invalid.This address is unreachable. Learn how Marketing Cloud actively suppresses these records in future sends: Bounce Mail Management
2999OtherThis address does not accept mail.This address is unreachable. Learn how Marketing Cloud actively suppresses these records in future sends: Bounce Mail Management
Soft bounce23001Mailbox FullRecipient's mailbox is full or has exceeded storage allocation.The subscriber's mailbox is full, which can meansthe mailbox has been abandoned. Consider  proactively suppressing this record from future sends. 
3002Inactive AccountAddress is temporarily unavailable.This status can be returned for records that were recently active, but have since been retired. For example, Gmail has a 2 year inactivity policy for users. Users marked as inactive will begin returning this error unless the account is reactivated.
3003Temporary Domain FailureReceiving domain temporarily unavailable.The receiving domain experienced DNS or a system issue at the time of attempted delivery. Consider trying to send to this record again at a later time.
3999OtherMailbox temporarily unavailable.The receiving domain experienced DNS or a system issue at the time of attempted delivery. Consider trying to send to this record again at a later time.
Technical/Other bounce54001Server Too BusyReceiving email server is temporarily overwhelmed with delivery attempts, from you and other senders.The receiving domain experienced DNS or a system issue at the time of attempted delivery. Consider trying to send to this record again at a later time. This message can also be returned when volume is too high, and may require closer attention to warming practices. 
4002Data Format ErrorEmail is rejected due to formatting or line length errors.Based on the response from the receiving server, the message was likely rejected due to an SMTP formatting issue with your content. The rejection typically means that the email is breaking SMTP protocol by having more than 999 characters on one line (with no carriage return). Consider reviewing your content formatting before attempting the job again.
4003Network ErrorConnection lost or timed out during delivery.The connection between Marketing Cloud servers and the receiving server has timed out. This can occur when the receiving server lacks adequate capacity to receive mail at the rate it is being sent.  Spreading sends to this domain across multiple days may help alleviate rate issues. This message can also be returned when volume is too high, and may require closer attention to warming practices. 
4999OtherFailed due to temporary failure or indecipherable bounce message.Based on the response from the receiving server, they were likely experiencing DNS or hardware failures at the time of attempted delivery. Consider trying to send to this record again at a later time.
Unknown49999UnknownUnknown.Receiving server returned an unknown/unexpected response. Consider retrying this send at a later time.
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