OWN Guide for Advanced Mail Server Settings Options For Shared Hosting Clients
Long title, short answer: This is how you get around the port 25 filtering/restrictions ISPs enforce. It’s also the most secure way to configure your mail client to send and receive mail from Own Web Now. In short, this is how you should be configuring your mail clients with Own Web Now virtual mail hosting.
In the guide: Walkthrough of SSL setup for SMTP, POP3 and IMAP for Windows Mail, Microsoft Outlook and Microsoft Entourage.