Hello Dennis, dennis f. castaneda wrote: > hi to all, > > In main.cf, all I needed was the following to get tls working. smtpd_tls_cert_file = /etc/postfix/smtpd.pem smtpd_tls_key_file = $smtpd_tls_cert_file smtpd_use_tls = yes smtpd_tls_loglevel = 1 Regarding permissions: make sure that the postfix user can access the certificate file because smtpd will run as postfix user.