smtpd_use_tls = yes
smtpd_tls_auth_only = yes
smtpd_sasl_application_name = smtpd
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
smtpd_sasl_local_domain = $myhostname
broken_sasl_auth_clients = yes

smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination
smtpd_sender_restrictions = reject_sender_login_mismatch