Mail very very slow

I have an iMac and an iBook. I also have Me.com.
Today, when i try and send basic messages (no large attachments) to myself via the iMac and using Mail, it takes way way too long for the message to leave. The progress bar (Mail Activity) is stuck at halfway. Yet, the message shows up on my iBook mail, and in my Mobile Me mail. Yet, they never show up in my iMac Mail and the activity bar never gets to 100% done.
Messages sent to myself from the iBook mail or the Mobile Me mail go through fine. I have speed tested my DSL and it is OK.
What and where can I look in various setting to correct this? Do I need to reinstall Mail on my iMac?
Thanks, Don

Enzo,
Welcome to the Discussions.
The topic at the link below, may be of assistance, even though your messages have not actually disappeared. The leftover files can be problematic in a number of ways:
There are numerous topics about issues surrounding conversion of mailboxes to Tiger and Mail 2.0, from earlier versions. One of them -- the lengthy topic at the link below -- may be of assistance:
http://discussions.apple.com/thread.jspa?threadID=413196
Let me know any questions, or discomfort you have. Post back here for specific instructions, and help after you have investigated your Mail folder, and mailboxes.
Ernie

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