Quote:
Originally Posted by id10t
Now that I've had coffee....
Find a open/public connection, spoof MAC address and connect. Telnet to port 25 on the hostname listed in the whois records for the primary MX of the domain of the person you want to contact, send HELO etc and your mail should be sent.
Only thing that would stop it would be DKIM/SPF records for whatever domain you claim to be sending from or the IP that your connection is coming from is in one or more lookup tables as "dont accept mail from this network/ip"
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And all that telnet communication is recorded. There's a long set of steps. Any little boo boo and you leak information.
Pretty much if you are asking how then you shouldn't try.