This document describes soft and hard email bounces, which occur when a message cannot be delivered.
Soft bounces occur when a mail server cannot deliver a message to a valid email address. There are various types of soft bounces:
Iterable does not automatically remove soft-bounced users from your project.
Iterable cannot determine the reason for the delivery failure (potentially because of a non-standard error message from the server).
The connection timed out while trying to deliver the message.
The recipient's inbox is full.
Based on the message's content, the server thinks it is spam.
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Hard bounces occur when an email is sent to a misspelled or outdated email address that is no longer in use.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 (marketing/transactional) and medium (email, push, etc.).
For example, consider the following message channel setup:
- Channel 1, an email marketing channel
- Channel 2, an email marketing channel
- Channel 3, a push marketing channel
- Channel 4, a transactional email channel
With these channels, Iterable unsubscribes from channels 1 and 2 users who hard bounce messages 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:
Click Export Events:
Select Email Bounces:
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: