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550 5.0.350 Remote server returned an error -> 553 Message filtered

  • 1.  550 5.0.350 Remote server returned an error -> 553 Message filtered

    Posted 05-26-2021 07:03 PM
    One of our employees has a weird problem. While replying to an email from an external source , they are blocked by antispam and the error says

    Reported error:

    550 5.0.350 Remote server returned an error -> 553 Message filtered. Refer to the Troubleshooting page at;https://knowledge.broadcom.com/external/article?legacyId;=TECH246726 for more information. (#5.7.1)

    DSN generated by:

    MEXPR01MB1541.ausprd01.prod.outlook.com

    Remote server:

    server-17.tower-382.messagelabs.com


     But if they compose a new email, it passes through and delivered to the recipient .