imap: fetching >= 300 mails results in server closing connection
This looks like the last one of our imap blockers for 0.5, and we've been facing it for some time. Fetching some hundreds mails makes tb hang.
Chiiph pinpointed it to a connection being closed by the server around the uid number 250.
(from redmine: created on 2014-01-14, closed on 2014-03-13, blocks #4972 (closed))