I can not delete a specific email message from my inbox

Background: Running 2.1 on a 3G 16gb iphone. Created an email that I sent to myself and a friend. The email has a photo embedded in it. Using gMail. I have 8gb free space on the iphone.

Problem: There is a single email message that I can not move or delete out of my inbox. YES, I can move and delete other emails BUT this one I can not delete. I can forward this email but if I try to delete it, I get a message saying "The message can not be move to the mail box trash". If I try to move it to another folder like the Sent folder, I get the following message: The message can not be move to the mail box Sent mail.
I have rebooted the iphone and tried to delete it, with no luck.
Any suggestions?