One Droid X user has this issue. This user had placed his Mailbox inside the Junk Mail folder and could not sync his previous phone, a BlackBerry with IMAP. I moved his folder back out to the root and IMAP worked fine then. Now with a Droid X and the Mobility Sync he does not receive messages but can send and those messages go into his GW Sent Items as expected.
Could there still be a folder issue that would cause this type of problem and how can I fix it? Thanks...Dan