[Dovecot] TLS timeout with Thunderbird

Jason Dixon jason at dixongroup.net
Fri Nov 17 23:53:18 UTC 2006

On Nov 17, 2006, at 6:37 PM, Steven F Siirila wrote:

> On Fri, Nov 17, 2006 at 06:32:18PM -0500, Jason Dixon wrote:
>> I stand corrected, Mail.app is using SSL (or at least, that's the
>> only option in the account settings).  After changing Thunderbird to
>> use SSL, it makes a successful connection.  I'm curious though;  I
>> have verbose_ssl enabled, and all I see is that a TLS login was
>> completed.  Why does it say TLS, if it's really using SSL?  Why do we
>> not see any additional information about the session?
> Terminology.  SSL has several versions: SSLv2, SSLv3, TLSv1.
> All are considered to be Secure Sockets Layer, with the last one being
> the most current version.  I think what some folks think of when they
> hear "TLS" is the more modern way of negotiating an SSL/TLS connection
> via POP's STLS or IMAP's STARTTLS or SMTP's STARTTLS commands.
> Whether you use an "SSL" port (e.g. 465, 993, 995) or a non-SSL port
> (e.g. 25, 587, 143, 110) and negotiate "SSL", you are likely using  
> TLSv1.

Thanks for the explanation.  Sounds like Thunderbird's "TLS" setting  
probably means to try STARTTLS, rather than use TLSv1.

Jason Dixon
DixonGroup Consulting

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