Outlook 2003 can't send, but settings seem OK

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Oldmaven

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Outlook version
Email Account
POP3
I'm running Outlook 2003 under Win 7 Pro x64. For the last few days, I've been unable to send messages from it, getting:

Task 'pop.secureserver.net - Sending' reported error (0x800CCC0F) : 'The connection to the server was interrupted. If this problem continues, contact your server administrator or Internet service provider (ISP).'

I will check my ISP. But the reason I'm also checking here is that when I check the Account Settings, and send a test message from there, it works fine.

How do I make it work again?
 
Solved it myself. Did a Web search for the error message and found several suggestions. I tried the simplest one, getting rid of a message stuck in my outbox, and now all is well.
 
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