Postfix SMTP Authentication – On The Secure Port Only

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Paste under mynetworks:

####### smtp auth
smtpd_tls_auth_only = no
smtp_use_tls = yes
smtpd_sasl_auth_enable =   yes
smtpd_sasl_type = cyrus
local_recipient_maps =
smtpd_use_tls = yes
smtp_tls_note_starttls_offer   = yes
smtpd_tls_key_file =   /etc/postfix/ssl/smtpd.key
smtpd_tls_cert_file =   /etc/postfix/ssl/smtpd.crt
smtpd_tls_CAfile =   /etc/postfix/ssl/cacert.pem
smtpd_tls_loglevel = 1
smtpd_tls_received_header   = yes
smtpd_tls_session_cache_timeout   = 3600s
tls_random_source =   dev:/dev/urandom
########

Then:

vi master.cf

Paste under smtp:

smtps   inet n   -   n   - - smtpd
      -o smtpd_sasl_auth_enable=yes
      -o smtpd_reject_unlisted_sender=yes
      -o smtpd_recipient_restrictions=permit_sasl_authenticated,reject
      -o broken_sasl_auth_clients=yes

Check the smtpd.conf file and amend it:

 

Paste under mynetworks: ####### smtp auth smtpd_tls_auth_only = no smtp_use_tls = yes smtpd_sasl_auth_enable = yes smtpd_sasl_type = cyrus local_recipient_maps = smtpd_use_tls = yes smtp_tls_note_starttls_offer = yes smtpd_tls_key_file = /etc/postfix/ssl/smtpd.key smtpd_tls_cert_file = /etc/postfix/ssl/smtpd.crt smtpd_tls_CAfile = /etc/postfix/ssl/cacert.pem smtpd_tls_loglevel = 1 smtpd_tls_received_header = yes smtpd_tls_session_cache_timeout = 3600s tls_random_source = dev:/dev/urandom ##

Source: Postfix SMTP Authentication – On The Secure Port Only