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.keist@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...