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Delivery problems

What is an OOB bounce?

R

E

Delivery problems

What is an OOB bounce?

An “Out of Band” (OOB) bounce happens when an email is initially accepted by the receiving server but rejected later. Think of it like a letter being accepted at a post office but returned days later.

Out of Band bounces do not have a RFC standard, therefore we do not receive the same details for an OOB as an in-band bounce - we are reliant on what the mailbox provider tells us.

Common reasons for OOB bounces:

  • The email address was found to be invalid

  • The mailbox became full

  • The message triggered spam filters after deeper analysis

  • The recipient server’s policies changed after initial acceptance

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