Postfix Refused on 587
Solution 1:
Yes, it's refusing port 587 because the entire section of master.cf is commented out.
#submission inet n - - - - smtpd
# -o syslog_name=postfix/submission
# -o smtpd_tls_security_level=encrypt
# -o smtpd_sasl_auth_enable=yes
# -o smtpd_client_restrictions=permit_sasl_authenticated,reject
# -o milter_macro_daemon_name=ORIGINATING
Uncomment this if you want Postfix to accept mail on this port.