Our email servers are.
POP = pop1.nsnoc.com
IMAP = imap1.nsnoc.com
SMTP = relay.nsnoc.com (Ports 25 and 2525)
Webmaill = http://webmail.nsnoc.com
SMTP server requires a username and password for authentication. These are the same as your POP / Imap Username and password.
Do not tick "My Server requires secure authentication"