[Dovecot] Dovecot with sasl/imaps/postfix and thunderbird

[Alex]

Hi,

> I have an fc18 system with postfix and dovecot-2.1.13 and have
> configured them to use sasl for SMTP Auth and Maildir with imaps.
>
> The system is running now, so I'm trying to set up thunderbird to
> autodetect all settings during the initial account setup. However, it
> seems to want to use port 143 and STARTTLS, and not port 993, which is
> what I would expect. When I force it to use 993, I receive a
> certificate failure message:
>
> Mar 12 23:20:45 propnew postfix/submission/smtpd[14423]: initializing
> the server-side TLS engine
> Mar 12 23:20:45 propnew postfix/tlsmgr[14425]: open smtpd TLS cache
> btree:/var/lib/postfix/smtpd_tls_session_cache
> Mar 12 23:20:45 propnew postfix/tlsmgr[14425]: tlsmgr_cache_run_event:
> start TLS smtpd session cache cleanup
> Mar 12 23:20:45 propnew postfix/submission/smtpd[14423]: connect from
> unknown[192.168.1.43]
> Mar 12 23:20:45 propnew dovecot: imap-login: Disconnected (no auth
> attempts in 0 secs): user=<>, rip=192.168.1.43, lip=66.111.222.101,
> TLS: SSL_read() failed: error:14094412:SSL
> routines:SSL3_READ_BYTES:sslv3 alert bad certificate: SSL alert number
> 42, session=<BGBS5MXXhQDAqAEr>

After doing a bit more research, it looks like it's failing because
Thunderbird doesn't prompt to accept the self-signed certificate
during the "auto config" part of the setup, so just falls back to
using port 143.

Although I think it's still using TLS on 143.

I'm really hoping someone can help me to clarify more specifically
what's going on here.

Thanks,
Alex