[Evolution] Evo hangs often

[Xavier Bestel <n0made free fr>]

Hi, 

I'm using 1.0.8 on debian with an IMAP server (Cyrus) on another debian
box, and Evo hangs regularly - I'm a killev addict. 
But now it's worst than usual: I killev, start Evo, press F9
(send/receive), then it opens the receive window and hangs. 
If I launch evolution-mail separately, it output this before hanging: 

[xav bip:~]$ /usr/lib/evolution/evolution-mail 

camel-WARNING **: camel_exception_get_id called with NULL parameter. 

I remember there was an env var to debug IMAP protocol problems. Could
someone remind it to me please ?

Thanks,

        Xav