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Topic: Sender address rejected: not logged in or Remote host said: 553 5.7.1

==== Required information ====
- iRedMail version:
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):
- Linux/BSD distribution name and version:
- Related log if you're reporting an issue:
====

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Re: Sender address rejected: not logged in or Remote host said: 553 5.7.1

According to the error message in your forum post title, you must enable SMTP auth in your mail client.

Please write forum post body in the feature.