Email Errors - Permanent Problems
User Unknown is a permanent email delivery error indicating that the recipient’s email account does not exist. This may occur if the account was deleted, deactivated, or the email address was entered incorrectly.
Before sending an email, verify that the recipient’s email address is spelled correctly.
Sample of User Unknown messages:
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host mail.domain.com[11.22.33.44] said: 550 No such user <[email protected]>: host host.example.com said: <[email protected]>: host mail7.example.com said: <[email protected]>: host mail.example.com said: <[email protected]>: Sorry, no mailbox here by that name. (#5.1.1) <[email protected]>: host example.com said: The message that you sent was undeliverable to the following: |
These errors usually appear as bounce-back messages. When you receive one:
- Verify that the recipient’s email address is correct.
- If possible, contact the recipient through another method and inform them about the bounce-back message.
- Do not delete the bounce-back message. It contains information that can help you and the email provider identify and resolve the issue.
If you manage a mailing list and a subscriber’s email repeatedly bounces, remove the address from the mailing list.