What is "Host name" in setting up mail accounts

I can't seem to send a message. I keep getting an error message that the connection to the outgoing server failed.

My Incoming Mail Server is "pop-server.tampabay.rr.com" is set up correctly, but
My Outgoing mail is "smtp-server.tampabay.rr.com" and this asks for a "Host Name"

What do I put in for the Host name? There is no hyphen available to set this up as "smtp-server....".
It shows an example of "smtp.example.com", but I don't have anything that is "smtp.tampabay.rr.com". So what do I use?

thanks

Message was edited by: Herschel Hochman