Look at the error message. Shouldn't smtoaugh be smtpaugh? AKA, a P where
the O is? Check the account settings.

Turn off e-mail scanning in your anti-virus program. It is a redundant layer
of protection that eats up CPUs, slows down sending and receiving, and
causes a multitude of problems such as time-outs, account setting changes
and has even been responsible for lose of messages. Your up-to-date A/V
program will continue to protect you sufficiently. For more, see:
http://www.oehelp.com/OETips.aspx#3

Note that for some AV programs, it may be necessary to uninstall the program
and reinstall in Custom Mode and opt out of e-mail scanning when the option
arises.

'nslookup smtoaugh.centurytel.net'

There is no such IP name for a host.  Strange that tech support didn't
catch this one unless, of course, you said it correctly when speaking to
them.

You have a couple of typos in the server name

smtoaugh.centurytel.net   should be
smtpauth.centurytel.net'

The O should be a P and the G should be a T

Fix in OE at Tools, Accounts, Mail, Properties, servers.

You'll also need the My Server Requires Authentication checked under
Outgoing server.