On 21.01.20 07:08, rdquiterio wrote:
In this case the Return-Path is kinda random, so there's no use to it.

return-path is header where the MDA uses to store original envelope from,
but usually not a real header.

On the other hand, looking to the headers_checks examples I cannot see how
could I allow all mail from a specific "Mail From:" to be relayed?

Is it possible?

no.  the "mail from:" is not a header, but an envelope from address, so you
must use check_sender_access instead.

However, you should not allow relaying based on envelope from address. Maybe on SMTP authentication or source IP address.

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