I have a server running a web site for a small company that has a few employees roaming about the country with laptops. They sometimes can not send mail because some ISPs block port 25, in peticular 1 local ISP I search and found a couple of threads that pointed me in the right direction. http://www.howtoforge.com/forums/showthread.php?t=7057 http://www.howtoforge.com/forums/showthread.php?t=28517 My problem is I tried the suggestions but the clients wont connect to smtp on either port 465 or 587. I am not sure if I am doing it right here is code from master.cf Code: # # Postfix master process configuration file. For details on the format # of the file, see the Postfix master(5) manual page. # # ========================================================================== # service type private unpriv chroot wakeup maxproc command + args # (yes) (yes) (yes) (never) (100) # ========================================================================== smtp inet n - n - - smtpd #submission inet n - n - - smtpd # -o smtpd_etrn_restrictions=reject # -o smtpd_client_restrictions=permit_sasl_authenticated,reject #smtps inet n - n - - smtpd -o smtpd_tls_wrappermode=yes # -o smtpd_tls_wrappermode=yes -o smtpd_sasl_auth_enable=yes #submission inet n - n - - smtpd # -o smtpd_etrn_restrictions=reject # -o smtpd_enforce_tls=yes -o smtpd_sasl_auth_enable=yes #628 inet n - n - - qmqpd Witch lines in paticular need to be uncommented for port 587 or 465 or both ? I tried many combinations and all uncommented and set it back to get port 25 working.