Is this message coming from his own server at the time of submission, or is it 
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On Jul. 10, 2024, 4:04 a.m., at 4:04 a.m., pe...@peterse-uithuizen.com wrote:
>Hello list,
>
>I have a problem tha my mailserver doesn't accept a mail from a
>specific
>exchange domain.
>The sender get an error message:
>451 4.4.0 Security status IlligalMessage
>
>Does anyone have an idea what is going wrong?
>
>Regards,
>Peter
>
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