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This is the error i get when using "Send ..... an email." in user profile.

The mail server does not understand the RCPT TO command. Reason: 553 5.7.1 <[email protected]>: Sender address rejected: not owned by user [email protected]

This is shown in my system mail logs when i use smtp settings.
post alerts are send perfectly but error only comes when one user emails to other user.