Problems receiving mails with 451 4.3.5 Server configuration error

Discussion in 'Installation/Configuration' started by W-C, Mar 16, 2018.

  1. W-C

    W-C Member


    I am facing problems receiving mails from a domain (outlook /office365), when I check the logs the error says "451 4.3.5 Server configuration error".

    Mar 16 08:02:37 mail postfix/smtpd[11282]: NOQUEUE: reject: RCPT from[]: 451 4.3.5 Server configuration error; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<>
    Mar 16 11:27:27 mail postfix/smtpd[26084]: NOQUEUE: filter: RCPT from[]: <[email protected]>: Sender address triggers FILTER amavis:[]:10026; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<>

    I've search on ISPConfig Forums and the internet, but it seems every case has a different error originator.

    The server is running under Centos 7.4.1708 and ISPConfig version 3.1.11. Attached you will find the and the configurations files.

    Thanks in advance...
    Last edited: Nov 9, 2018

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