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From time to time you need to troubleshoot your mail server. A telnet test can help to test connectivity to smtp port 25.

from a command prompt in windows, type:

telnet mailservermail 25 (for internal tests - EG. telnet exchangeserver 25) or for an external test :

telnet mail.mydomainname.com 25

Then type the following commands to send a mail:

helo domain name (EG. helo mydomainname)

mail from: email@address.com

rcpt to: someone@address.com

data

Subject: test message

When finished, hit ENTER twice, then type:

.

quit