Currently Being ModeratedNov 26, 2012 6:51 PM (in response to shatfield22)
If you deleted it, simply add the mail server again.
Accounts > Outgoing Mail Server > Edit server list...
It may be easier to delete the account and add it again. If it is an iCloud, IMAP, or Exchange account your emails messages on the server will still be there.
Currently Being ModeratedNov 26, 2012 6:55 PM (in response to shatfield22)
You're not deleting the server, you're just deleting the address of the server in your email client. As said above, you can just add the address back.