imapsync stuck with some mails

[Sébastien Riccio <sr at swisscenter dot com>]

Hi,

I'm currently using imapsync to migrate mails from a courier-imap to a 
zimbra server.

Everythings runs well and that imapsync does a really good job.

Still, there are some mails in some user accounts that hangs imapsync.

When trying the sync with --debug and --debugimap, I got this output 
that seems revelant  (here are the last lines):

Uoz4jjA211PVA3110Yuv9IFjmhumh8fMkf3oQtfY71K2lz2+07G+0g8HT4KVW31HftDd6Uez6W2e
8/xVhsR+qbNvb0Z2cdkoiB+Y19qDfRgK8lzwXMDg0aGQONYId5qPpy7e55kGGtB151l3irLPtW07
o2RrPgofpYHj28VII4P3jt4/wW3Otur/AP/ZDQplbmRzdHJlYW0NZW5kb2JqDTUgMCBvYmo8PC9J
bnRlbnQvUGVyY2VwdHVhbC9TdWJ0eXBlL0ltYWdlL0xlbmd0aCAxOTg4L0ZpbH<END>
while processing LITERAL
Still need 895527 to complete literal string


After this, the process never finish or exits and the rest of the 
mailbox is not processed.

Any idea what means this LITERAL thing ? :))

Thanks a lot for your help.

Best regards,
Sébastien