Several weeks ago I responded to a lengthy message by adding a few lines at
the bottom. The message was never sent and appears to be stuck somewhere in
the system. Every first time I attempt to send or receive a message this is
what I get:

Outlook Express could not post your message. Subject ' Desperately
seeking caption', Account: 'Eternal-September', Server:
'news.eternal-september.org', Protocol: NNTP, Server Response: '441
Duplicate message (MD5)', Port: 119, Secure(SSL): No, Server Error: 441,
Error Number: 0x800CCCA9

How can I or somebody clear it?

Ken Bland