Hello everyone, first time poster here. I've decided to set my LUG mail server up with OpenSMTPD, because its configuration syntax it's clear and short and because it's one of the most minimal/suckless SMTP daemon I know.
I trying to avoid From header spoofing when messages come from local users connected through Unix socket. When connections come from outside I'm able to achieve this with the senders option [1] of the listen on interface command [2]. How do you prohibit local users from changing the From header with OpenSMTPD? The LUG server runs on Debian GNU/Linux 12 "bookworm". Thank you very much for your help and for writing such a wonderful program. [1] http://man.openbsd.org/smtpd.conf#senders [2] http://man.openbsd.org/smtpd.conf#listen -- Matteo Bini
