I Cannot Use The Aspmail. Help Please

WHEN I USE ASPMIAL FOR SENDING MAIL. THERE IS ERROR:

Mail failure. Check mail host server name and tcp/ip connection…
Operation timed out

THE SMTP SERVER NAME IS CORRECT. AND THE TCP/IP CONNECTION IS ALSO IN OKAY.
PLS HELP ME. WHAT SHOULD I DO IN THE NEXT STEP? ?(

try using “localhost” as the server name, or use authentication.