Can't send POP3 email using Outlook 2003, but test email sends OK

I switched my email setup in Outlook from IMAP to POP3 so I could delete messages from my hosting email account (the mailbox was getting bloated)

I have set up the account as POP3.  I can receive emails fine.  The test email sends OK to the account when I test the settings during setup.  But when I save the setting and try to send from Outlook, it won't send emails.

Help!!!

My settings are

POP3 incoming:  mail.mydomain.com
SMTP outgoing:  mail.mydomain.com
Outgoing SMTP requires authentication is checked
POP3 port:  110
SMTP port:  2525
mycomacAsked:
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Matt VCommented:
What is the error you are getting?  It is likely that the mail server is not relaying for your PC.

Can you send an email to yourself or another account on your domain?  Not the test email, just send yourself one.  If that works and you cannot send to anyone else, it is probably a relaying setting on the server.
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mycomacAuthor Commented:
I can't send a message to any address from the POP3 account.  I don't get an error message - Outlook just hangs up showing "Preparing to send/receive ..."

If I only have a message sending from one of the other IMAP accounts, it sends normally, but if there is a message from the POP3 account in the outbox, nothing will send - it makes the send function fail all messages in the outbox, regardless of which account the message is sent from.
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mycomacAuthor Commented:
I solved problem by setting "outgoing server requires authentication" and manually spcifying the username and password
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