I am currently using Sendmail and OpenWeb mail. Both seem to work flawlessly. I am using SSL to retreive mail imap-s port 993. I want to secure outgoing mail using ssl. Security on my system appears tight, I get daily attempts by spammers to relay mail, but so far, so good I hope. I am pretty sure I need to open port 495 with IP tables. I am using Red Hat Advanced Server. Is there lines in the sendmail.mc and use m4 for the sendmail.cf? Do I need to specify this port in /etc/services file? What else needs to be configured?