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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