On 9/14/2020 6:35 AM, Fourhundred Thecat wrote:
> Can I reject messages that have different envelope from and header from?
>
> Or what would be the best approach ? 


Are you publishing an SPF record?  Are you using DKIM?  Are you
publishing a DMARC policy (even one with policies of none)?  Are you
using Apache SpamAssassin?

Regards,
KAM

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