FAQs in this section
What is a bounce message and error code?
What are different bounce categories?
What are the different error codes?
What are the different traditional bounce codes?
What are the different enhanced bounce codes?
Can I customize the bounce messages?
I need a detailed report regarding a bounce message. How can I get it?
What is a general bounce?
What is a 'DNS failure' error?
What is a 'Mailbox full' error?
What is a 'Message too large' error?
What is a 'Mail block - relay denied' error?
What is a 'Mail block - general' error?
What is a 'Mail block - spam detected' error?
What is a transient bounce?
What is a challenge or response bounce?
What is a 'Bounce - no email address returned' error?

What is a hard bounce?

Your email is permanently undeliverable to this email address because the address is either fake, was entered incorrectly, or the user mailbox or domain is no longer active.
For example, the following are hard bounce error messages:
  • Unknown or illegal alias
  • Address rejected
  • No such user here
  • A bad destination mailbox address
  • Rule imposed mailbox access for refused: user invalid
To know more about Email Bounces and Error Codes, click here.
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