Correct on that. I think if you're going to use SSL SMTP you're going to need to open TCP/465 on your firewall. If you have the mobile add-on it's a shame you're not using it. It would really be the way to go. I assume you're also not giving your users webmail access if you have port 443 closed as well. I guess I don't see why you would have POP3(s) or IMAP(s) open, but not HTTPS.
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Release 6.0.2_GA_1912.UBUNTU8_64 UBUNTU8_64 NETWORK edition + Mobile Option
Activesync with Moto Q9C, HTC Touch Pro, Palm Pro, & Palm Pre
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