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Monday, May 2, 2022

Remote Server returned '550 5.5.0 Requested action not taken: mailbox unavailable.'

 The error message"550 5.5. 0 Requested action not taken: mailbox unavailable" that you are getting is a bounce message that could be due to: The e-mail address that you're sending to doesn't exist. there's a problem with your recipients account.


  • The e-mail address that you're sending to doesn't exist.
  •  there's a problem with your recipients account.
  •  your recipient have too much message and the server hosting it isn't accepting any more.

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