One of my users had 5 e-mails that were composed offline send once he connected to the net.

He then got 5 separate (but the same) returns with the following message:

Note: File Upload Fault. Please contact your system administrator regarding maximum message and attachment sizes.

Error Text: <html><head><title>Connection Failed</title></head><body><h1>Connection Failed</h1>
No HTTP response receive.</body></html>

Then, his Outbox was empty and it seems like the e-mail completely vanished. Any ideas? He was on Windows XP Pro and using Outlook 2003.