In an older episode, on 2014-02-23 00:38, Peter Marius wrote:
So it is just a coincidence that the "MAIL FROM" and "From:" match for web.de?
Both ways of usage are common and legitimate, so I would not call it a
coincidence. See
https://de.wikipedia.org/wiki/SMTP#Protokoll
Nothing wrong/fishy with the way GMX is using it?
Nothing wrong as far as I can tell.
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?
In my view, header_checks is the only way to match From: header lines
reliably in Postfix. Your posted sender_access file would not work for
that since it does not contain any information which header line is
supposed to be matched.
See
http://www.postfix.org/header_checks.5.html
or
man 5 header_checks on your server.
Hint:
/^From:.*whatever/ action
I am not a dovecot expert, but I would rather use sieve in Dovecot than
header checks in Postfix if I had the choice.
BTW: I find DISCARD daring for such a filter, are you really sure you
will not miss any important information concerning your freemailer
accounts by simply sending those mails to oblivion?
Cheers,
wolfgang
