I have 3 undeliverable read receipts stuck in outlook 2003 and as a
consequence the send action of send /receive tries to send these three read
receipts but it is caught in a loop and cannot send them, as a result I
cannot send any message.

I have tried to uninstall and reinstall Outlook but to no effect.

Using exactly the same pop settings in OE I can send and receive mail so
what could be the problem? I have been using Outlook for 3 years and have
never had this problem before.