A fork of Spamhole by Dustin Trammell for modern Linux
SpamHole Doc
http://www.spamhole.net
I)ruid [CAU] druid@caughq.org
Many spammers constantly search for open SMTP relays, or mail servers that will allow anyone to send e-mail through them. Using these servers, they send mass amounts of unsolicited bulk mail (SPAM). Most diligent mail admins on the Internet these days do not run open relays, however there are many out there that still do. Many viruses and trojans are beginning to appear that turn an unsuspecting cablemodem or DSL user's computer into an open relay without the user's knowledge. The most common way for spammers to find these open relays is for the virus or trojan to report it's existance directly to them, or by methodically scanning netowrks looking for them. This project hopes to make the latter method a waste of time and effort.
To accomplish our goal, we take the chaff approach. By creating as many false 'open relays' on the Internet as possible, we hope to make the detection and use of a real open relay as much of a chore as we can, as well as waste as much time and effort as we can of any spammers that find and use our spamholes as if they were real open relays. To accomplish this, we take a rather simple approach:
When an SMTP client connects to our spamhole, the spamhole will emulate an SMTP open relay, happily accepting any email messages that the client wishes to send to it, however rather than actually delivering the messages, it will silently drop them.
This is a REFERENCE IMPLEMENTATION. You should compile and run at YOUR OWN RISK. This code is most likely riddled with bugs. and is meant to provide a proof-of-concept only. You are highly encouraged to develop your own spamhole code and share it with others through this project. The more platforms supported, the more chaff the spammers will have to deal with to find the REAL open SMTP relays.
spamhole is released under the GNU General Public License (GPL). You can find more information on the GPL here:
http://www.gnu.org/copyleft/gpl.html
To install and run:
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Check your config options at the top of config.h
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type 'make'
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Copy spamhole to wherever you would like it to live.
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Execute spamhole as root, it will drop privs to the UID you defined in spamhole.h after binding to it's port (usually 25)
spamhole.h Config Options:
UID - spamhole's running UID (after binding to the port, it drops privs to this user)
LOCAL_IP - The local address you want spamhole to listen on (use "0.0.0.0" for all local addresses).
LOCAL_PORT - The local port for spamhole to listen to (usually port 25)