This document describes soft and hard email bounces, which occur when a message cannot be delivered.
Soft bounces
Soft bounces occur when a mail server cannot deliver a message to a valid email address. There are various types of soft bounces:
IMPORTANT
Iterable does not automatically remove soft-bounced users from your project.
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SoftBounceGeneral
,SoftBounceUndetermined MailBlockGeneral
Iterable cannot determine the reason for the delivery failure (potentially because of a non-standard error message from the server).
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SoftBounceTimeOut
The connection timed out while trying to deliver the message.
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SoftBounceMailboxFull
The recipient's inbox is full.
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SoftBounceContentRejected
Based on the message's content, the server thinks it is spam.
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SoftBounceSpamDetected
orMailBlockSpamDetected
The ISP has detected content from your email that resembles spam. The trigger can be related to your content, IP address, or sending domain that has a poor reputation.
Hard bounces
Hard bounces occur when an email is sent to a misspelled or outdated email address that is no longer in use. By default, Iterable automatically unsubscribes hard-bounced users from the sending message channel and other channels of the same type and medium.
For example, consider the following message channel and type setup:
Message Channel ID | Channel Type | Channel Medium |
---|---|---|
1 | Marketing | |
2 | Marketing | |
3 | Marketing | Push |
4 | Transactional |
With these channels and types, Iterable unsubscribes from channels 1 and 2 users who hard bounce a message from channel 1. However, those users stay subscribed to channels 3 and 4.
Exporting bounce reports
Use the Campaign Analytics view to export in-depth bounce reports:
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Click Export Events:
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Select Email Bounces:
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This downloads a CSV file that lists all bounced emails and their bounce types:
Bounces in segmentation
Iterable's segmentation tool makes it possible to segment for users who have email bounces of various types:
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