Bounced email can seem like a blackbox, hard to decipher. There are over 100 different bounce errors that can happen. Learn more about each of them! We want error messages to be easier to understand and have clearer remedies.

The first step is to find the right bounce error, using our search box or links below. Then, for that specific bounce, you will find:

  • The explanation and advice we offer in our Better Bounces™ messages
  • The official error definition
  • Community feedback about the error
  • How to get more help about that specific bounce type


Find your bounce type by entering keyword(s) or error code (e.g. 4.1.2) in the search bar or browse the below links.

Search for Bounce Types


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All about other bounce errors.