Sometimes sugar is not able to read emails from an IMAP inbox.

When I click the messages subject, I see the "loading"-icon and it takes forever. Sometimes the message appears after 40s, sometimes it does not come up at all.

Accordung to Firebug it is the following ajax request that hangs:

action EmailUIAjax
emailUIAction getSingleMessage
The email in question is even stored in the cache directory, so normally it should be loaded very quickly!
(cache directory IS readable!)

Does anyone know where to search for a solution???