Outlook 2003 will not send my e-mails unless I forward

[SteveCop]

Using Outlook 2003, WinXP SP2, ADSL connection.
Recently Outlook has refused to send my e-mails after creation. They are listed in the outbox but not in italics (ready to send) and have "none" in the sent date column. The only way to send the message is to select each one and "forward" the message to the original recipient. The forwarded message goes normally, the other stays in the outbox for good until manually deleted. Makes no difference if there are attachments to the mail or not. No changes of security policy have been created recently - any other ideas please?

 

[astrosrule]

Have you upgraded to Office2K3SP2?

 

[SteveCop]

I hadn't but have now and it has made no difference. The strange thing is, if I leave one of these unsent/can't send messages sitting in in the outbox, others seem to be sent as normal! If I di that, though, it is irritating because I constantly get the "There are unsent messages in your outbox" message when closing. Probably the least of the two evils though....