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:
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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)
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DSN generated by:
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MEXPR01MB1541.ausprd01.prod.outlook.com
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Remote server:
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server-17.tower-382.messagelabs.com
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But if they compose a new email, it passes through and delivered to the recipient .