Interesting.. smtp_header_checks did the trick, header_checks did not.
2017-05-25 14:26 GMT+02:00 Albrecht Dreß <albrecht.dr...@arcor.de>: > Am 25.05.17 14:20 schrieb(en) spamv...@googlemail.com: > >> since three days I'm trying to remove my internal and external IP from >> the Message header when I'm sending mails. But no solution has worked so >> far. >> >> What I did: >> created a new service in master.cf >> > > A simpler solution (working for me) for all outgoing messages is to add > > <snip> > smtp_header_checks = pcre:/etc/postfix/clean_outgoing_headers > </snip> > > to /etc/postfix/main.cf. The file /etc/postfix/clean_outgoing_headers > contains > > <snip> > # drop mail application information > /^X-Mailer:.*/ IGNORE > /^User-Agent:.*/ IGNORE > /^X-Enigmail-Version:.*/ IGNORE > # drop all received stuff > /^Received:.*/ IGNORE > </snip> > > which additionally removes information about the MUA which may be used by > an attacker to craft a targeted attack. > > Hth, > Albrecht.
