> >> smtpd_tls_auth_only = yes > > > Do you know what this parameter setting does? >
After hours of digging into this, that particular message seems to have come up because I didnt want plaintext coming across in the smtp connection so I set: smtpd_sasl_security_options = noanonymous, noplaintext By having noplaintext I got the msg because my dovecot and SASL configs weren't setup to handle anything but plain and login, so... in /etc/dovecot.conf auth default { mechanisms = plain login digest-md5 } in smtpd.conf: pwcheck_method: saslauthd mech_list: plain login digest-md5 Adding digest-md5 solved that error message. The SASL doc didnt explain about setting up smtpd_sasl_security_options with noplaintext (afaik) in what I was reading per the mechanisms so I got lost. Im just posting this for the next guy who might have a problem. Thanks for your pointers.