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SMTP Response 221


<SERVER> Service closing transmission channel

What does this mean?

This response is stating the the session or connection to the mail server is now ending. Suggesting that all processes have completed, this could be successful or due to failures.

There is not a "fix" for this SMTP Response code, as it's not specifically an error.

SMTP Error 221 Examples

  221 Closing connection
  221 Goodbye
email/troubleshooting/error-numbers/221.txt · Last modified: 2020/06/12 09:11 by Karson N.