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Undelivered Mail


when i try to send some messages to some recipients i face this problem
i don't know if this problem in exchange server or email gateway in sophos
but as you can see the response came from sophos

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  • HI There,

    The issue occurs because the recipient Email server does not verify the recipient address and considers it invalid (genuinely or not that we can not be sure of). Please reach out the Email admin of the recipient Email server.