Problem solved.
I had my cipher list too restricted.  I went back to the default:

Was:
MEDIUM:!LOW:!SSLv2

now its:

ALL:!LOW:!SSLv2:!EXP:!aNULL

Thunderbird version 45 is happy now. We are in process of migrating over to Office 365, so just have to keep this server happy for a few more months.



--
C. J. Keist                    Email: cj.ke...@colostate.edu
Systems Group Manager          Solaris 10 OS (SAI)
Engineering Network Services   Phone: 970-491-0630
College of Engineering, CSU
Ft. Collins, CO 80523-1301

All I want is a chance to prove 'Money can't buy happiness'

On 04/21/2016 14:47, CJ Keist wrote:
All,
    Just ran into issue with the latest Thunderbird release today,
version 45.0.  This version will no longer login to our dovecot 1.2.17
version. I now this is old version but wanting to know if there is
anyone finding a solution to this?

Right now our work around is to reinstall Thunderbird version 38.7.2

Thanks...

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