Hello, how to disable TLS on smtpd. I find that i must change in master.cf smtpd_tls_security_leve=encrypt to smtpd_tls_security_level=may. Unfortunately i must disable TLS because i have a lot old printers which not support TLS...
SMTP without tls is active by default, so there should be no change needed. Do you use the right port (25) in the setup of your printers? Don't use port 587 as that's a TLS only port.
