Apple mail works but thunderbird unable to connect

[Alexander Dalloz]

Am 23.06.2020 um 17:38 schrieb Dshah:
> I disabled postscreen and enabled logging, I have all ports working except
> 993,  in log when I try to connect on port 993
> 
> dovecot: imap-login: Disconnected (no auth attempts in 0 secs): user=<>,
> rip=10.244.0.24, lip=10.244.0.108, TLS handshaking: SSL_accept() failed:
> error:1408F10B:SSL routines:ssl3_get_record:wrong version number,
> session=<rEH6ocGoOtUK9AAY>
> 
> I found that I could disable ssl3 by "ssl_protocols = !SSLv2 !SSLv3" but
> this option is not working (dovecot 2.3.10.1 (a3d0e1171)

Likely you have configured your mail client to issue a STARTTLS 
connection rather than a SSL one (implicit versue explicit SSL).

Port 143 -> STARTTLS
Port 993 -> SSL / TLS

Alexander