==== Required information ====
- iRedMail version: 0.9.0
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): Admin-Pro-LDAP 2.2.2
- Linux/BSD distribution name and version: Ubuntu 14.04LTS
- Related log if you're reporting an issue:
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What will be the recommended way to just enable encrypted IMAP/POP/SMTP (on port 993/995/465), and disable the plain ones(on port 143/110/25) ?
That is to say, is it possible we can turn off these plain/insecure incoming ports (143/110/25) in firewall, and make iRedMail still function properly on email sending & receiving over the secured/encrypted ports (via SOGo web-interface and Mozilla ThunderBird) ?
iRedMail uses STARTTLS which will do the auto-switch depends on the mail server, between plain and secure connection. Is there an option we could force STARTTLS to use only the secure connection (via 993/995/465)?