A soft bounce means that the email address was valid, and the email message reached the recipient’s mail server. However, it bounced back because of the following reasons:
- The mailbox was full (the user is over their quota)
- The server was down
- Temporary rate-limited/blocked
The Maropost platform is designed to continuously send these messages for up to 72 hours until the message is delivered. If a message is continuously deferred for 72 hours, the platform will then add the affected addresses to soft bounce list
For bounces that are a result of a recipient’s mailbox being full, the platform will add the affected address to the Do Not Mail (DNM) list for any messages that are continuously deferred for 72 hours; even after 3 consecutive mailings.
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