Comment 15 for bug 1758922

OK, it appears imaplib2 is crashing with one of the GMail accounts. I could send you a modified module which can debug this in detail, but the output can be massively verbose with three mail accounts, so we'll use it as a last resort.

It would be helpful if you could delete two of your accounts from Unity Mail and run it again with only one of them, do some testing, and add back a second one only if you get none of those "last 20 log messages" lines. It is imperative to allow UM to run for at least 1-2 hours to let the mail server drop the connection a few times and UM to reconnect (it happens every 20-30 minutes, depending on mail server settings).

If all is well, you should see alternating "Connection ... established" and "Connection ... closed. Trying to reconnect." lines only. How often this happens is irrelevant.