Enable port 993 IMAPs to get iPhone Mail app to work with IMAP against iRedMail (dovecot) server.
I have a iredmail server fully working with many IMAP clients (Outlook, Mac Mail, Thunderbird, etc...), however I have been battling getting it to work on IOS / iPhone Mail IMAP client.
After hours of toiling and googling, I found the solution (or issue). The secret is to enable port 993 (IMAP SSL / IMAPs) protocol in my firewall NAT rules. Meaning I had to port forward port 993 also for IMAPs. I guess this is because the iPhone does not support IMAP SSL TLS with STARTSSL using only port 143.
I hope this clue help save time for somebody else.
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