Mail Sending Issue on Plesk 7.5

I am running Linux Version of PLESK 7.5. I am unable to send any email via outlook. I can receive email just fine, but when I attempt to send a message, I receive an error saying: "The connection to the server was interrupted." I am able to send just find via webmail, but it will not work with my POP3 account. Is there a way I can check the emails in queue to be sent, or to find out what's going on with this?

 

 

 

 

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