Email delivered back with "550-Verification failed" error

Maintenance
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Hi there,

After got my MiAB running, finally, I am starting to do some tests.

I was able to send and receive emails normally to Gmail, for example (as well as for other domains).

But one domain in specific (hosted at HostGator) is delivering my emails back saying that “no such user here”.

Well, I could see through the logs that this refers to the email I am using in my MiAB, i.e., regarding the mail account which is sending the message.

Below are the log entry:

Feb 28 16:01:31 box postfix/smtp[50070]: E3FD9228F4: to=<recipient@domain.com>, relay=mail.domain.com[RECIPIENT_SERVER_IP]:25, delay=14, delays=0.1/0/9.1/5.1, dsn=5.0.0, status=bounced (host mail.domain.com[RECIPIENT_SERVER_IP] said: 550->550-Verification failed for <sender@domain.com> 550-No Such User Here" 550 Sender verify failed (in reply to RCPT TO command))

Anyone knows how to solve this problem? Or, can it be fixed?

Thanks again.

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Thank you very much.

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