UAVTGrad

I've created a new POP3 email service in PO and can receive messages but can't send. I'm using an ethernet card.
I get a message that says the following:

"The message(s) could not be sent. Check that you have network coverage and that your account information is correct. Then try sending again."

I'm using the same incoming/outgoing settings that I use on my pc with regular Outlook (pop3 and smtp.)

I've also turned off/on the option "outgoing e-mail server requires authentication."

Any suggestions?