Taking NormanS
's lead but from ATT Uverse:
telnet smtpauth.sbcglobal.net 25
220 nlpi162.prodigy.net ESMTP Sendmail 8.14.4 smptauth/8.14.4; Sun, 18 Nov 2012
05:19:02 -0600
quit
221 2.0.0 nlpi162.prodigy.net closing connection
Connection to host lost.