Comment 9 for bug 150571

I can reliably reproduce this problem. I believe it's a connection timeout somewhere in the IMAP message download. It only happens when I'm using a slow connection (less than around 100kb), and then any new mail over about 10k will cause Thunderbird to hang. The network monitor shows that all network activity stops after a short period.

This is a major problem for me as it prevents me from using Thunderbird while I'm connected using mobile broadband in less than perfect signal areas.

I've attached strace output. Thunderbird started downloading the first new email and after about 5 seconds the progress bar stopped moving, after another 10 seconds Tbird stopped responding completely. ^C on the strace hung after detaching 2 threads. Had to force-quit tbird.