Udo Rader: > Hi, > > is there a possibility to only allow PLAIN authentication when TLS or > similar encryption has been negotiated? > > So far, I only found a way to either completely disable PLAIN > authentication or allow it in general.
Postfix SMTP client:
smtp_sasl_security_options = noanonymous, noplaintext
smtp_sasl_tls_security_options = noanonymous
Postfix SMTP server:
smtpd_sasl_security_options = noanonymous, noplaintext
smtpd_sasl_tls_security_options = noanonymous
Wietse
