* John Plate <john.plate...@gmail.com>: > Hi > > I introduced "smtpd_reject_unlisted_sender=yes" in main.cf to avoid attempts > to login to my smtpd.
This doesn't block logins, it merely blocks envelope sender addresses it KNOWS NOT TO exist (mainly stuff from your own domain -- i.e. if you only have the address a@domain.example, nobody can use b@domain.example or c@domain.example as sender) > This morning it looks like an unknown ip-number succeded: > > Jun 23 07:38:02 lunar postfix/smtpd[14806]: connect from > unknown[185.137.111.22] What you want is http://www.postfix.org/postconf.5.html#reject_unknown_client_hostname or http://www.postfix.org/postconf.5.html#reject_unknown_reverse_client_hostname in Postfix lingo it means "block IP addresses with no hostname assigned or the assigned hostname doesn't resolve back to the same IP. -- [*] sys4 AG https://sys4.de, +49 (89) 30 90 46 64 Schleißheimer Straße 26/MG, 80333 München Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263 Vorstand: Patrick Ben Koetter, Marc Schiffbauer Aufsichtsratsvorsitzender: Florian Kirstein
