Aw: Re: Problem with filtering GMX emails in sender_access

[Peter Marius]

Thanks Wolfgang and Wietse for your explanations!

 

So it is just a coincidence that the "MAIL FROM" and "From:" match for web.de?

Nothing wrong/fishy with the way GMX is using it?

 

Where would I filter the actual "From:" of the header? In Postfix or Dovecot?  

 

I found header_checks, but maybe there is a simpler comand where I can reuse the sender_access file?

 

Cheers,

Peter

 

 

Gesendet: Samstag, 22. Februar 2014 um 21:11 Uhr
Von: "Wolfgang Zeikat" <wolfgang.zei...@desy.de>
An: postfix-users@postfix.org
Betreff: Re: Problem with filtering GMX emails in sender_access

In an older episode, on 2014-02-22 20:47, Peter Marius wrote:

> Return-Path: <#123456...@gmx.net>

> From: GMX Magazin <maili...@gmxnet.de>

> My understanding was that sender_access will filter the address in "From:",
> but obviously it does not?

See
http://www.postfix.org/postconf.5.html#check_sender_access

> Is GMX doing something wrong here? Seems like they are using another "From:"
> in the negotiation phase than in the later data transfer?

MAIL FROM (in the above Postfix documentation) is what you call
"negotiation phase". From: is something else.

See
https://en.wikipedia.org/wiki/Return-Path

Regards,

wolfgang