[SOLVED] Submission Ports for Postfix Mail Server For "Virtual Users And Domains With Postfix, Courier, MySQL And SquirrelMail (CentOS 6.0 x86_64)" which submission port should I use when sending from outside my network but not using the Squirrelmail tool? I tried 587 and couldnt connect and I tried 465 but didnt think it set up wrapper_mode (which I dont really want anyway) and couldnt connect. I try 25 simply and it works. Im confused. 587 and 25 are open in my firewall btw on my router using port forwarding/triggering. Thanks, Stephen.