Wietse:
> I asked for a copy of the (headers of the) resulting message that
> Postfix delivers.
> - Does it have a Received-SPF header?
> - Does it have two?
Carlos Velasco:
> 1. Deleting the header in the milter or doing nothing in the milter
> has the same result: final email has only 1 Received-SPF header.
>
> Received-SPF: Pass (mailfrom) identity=mailfrom;
> client-ip=2620:137:e000::1:20; helo=out1.vger.email;
> envelope-from=linux-kernel-ow...@vger.kernel.org; receiver=<UNKNOWN>
> Received: from out1.vger.email (out1.vger.email
> [IPv6:2620:137:e000::1:20]) <-- *this is the own Received generated by
> postfix*
Thank you for showing concrete information.
It seems that the order of these headers is the problem.
The Postfix Milter implementation expects that the header order looks like:
Received: from out1.vger.email ... (Postfix-generated)
Received-SPF: (and other Postfix-generated headers)
...headers from remote SMTP client...
...date/message-id/etc. headers that Postfix might add to an original
submission..
Unfortunatelty the PREPEND action will put the Received-SPF header
BEFORE the Postfix-generated Received: header. And since the Postfix
Milter implementation hides the first header, a Milter cannot delete
that Received-SPF: header.
I'll do some tests to confirm that this is the problem.
Wietse
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