determine the MX for the domain

nslookup set type=mx mydomain.com

should return something like:Server: ns2.mydom.com Address: 192.168.1.254 mydomain.com preference = 10, mail exchanger = mx.mydomain.com mydomain.com nameserver = ns.mydomain.com mx.mydomain.com.com internet address = 1.1.1.1 mx2.mydomain.com internet address = 1.1.1.2

The last two lines are the mail server (MX = Mail Exchange). In this case, 1.1.1.1 and 1.1.1.2.

telnet 1.1.1.1 25

Server responds with: 220 mx.mydomain.com SMTP
HELO

Server responds with: 250 OK
MAIL FROM:user@mydomain.com

Server responds with: 250 Address Ok.
RCPT TO:user@otherdomain.com

Server responds with: 250 user@otherdom.com OK
DATA

Server Responds (or may not): 354 Enter Mail
Enter message, then on a new line,
.

exit

The message should now be sent. By modifying the MAIL FROM and RCPT TO lines, you can test for open relay.

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