Mail cannot be delivered from external network

Created:

2016-12-18 07:24:22 UTC

Modified:

2017-08-08 13:40:31 UTC

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Mail cannot be delivered from external network

Applicable to:

  • Plesk Onyx for Linux

Symptoms

  • mail cannot be delivered from external network to example.com and there are no errors in /var/log/maillog
  • domain example.com configured to use external mail server mx1.antispam.server.com in Home > Domains > example.com > DNS Settings
  • the following bounce message can be received on external mailbox:

    user@example.com
    SMTP error from remote mail server after end of data:
    host mx1.antispam.server.com [10.20.30.40]: 550 High probability of spam
  • local mail can be delivered without any issues.

Cause

There are strict anti-spam rules on external mx1.antispam.server.com mail server

Resolution

  1. Review rules on mx1.antispam.server.com mail server

Or

  1. Switch to Plesk mail server, in that case MX record shoul like the following one:
    example.com.    MX (10) mail.example.com.
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