Wow 2/21/05 and we see this prob rear it's ugly head again...using cpanel 10.0.0-r85 and i am seeing the same quote problem as listed here, the only work arround i have seen is to remove the quote for all email users - sorry guys for bring back such an old post but i try to search for any probs that i am having b4 posting anfd found this thread.
started a new bug request for this since could not find one closed dealing with this issue
http://bugzilla.cpanel.net/show_bug.cgi?id=2119
Also have summited a support request on this issue and will post back here if this is resolved
