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 | Komuves Consulting
Anti-Spam Campaign |
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Komuves Consulting has a policy of not allowing any
unsolicited bulk email (spam) of any sort to be sent to or sent by any of its
users. Filtering of incoming spam email happens at the SMTP connection
level using Sendmail, which is being run here with all of its built-in anti-spam
provisions. I make use of several blackhole facilities, including my own
banned list. If a banned site tries to send email to any of my users, they will
receive a descriptive error while connecting to the SMTP port, which will refuse
to accept the email. If spam is received by a user, they can simply bounce or
forward the message with full headers intact to abuse@kom.com.
Here is a publically-viewable
log of spammer rejection statistics for this server, which
is automatically updated daily.
Spam Filters/Tools Used Here
- Sendmail Anti-Spam Provisions. Including verifying headers for valid sender hostnames.
- Komuves Consulting Banned List. My own blocking list.
- Spamhaus Block List, spamhaus.org List of IP
blocks of static spam sources, including known spammers, spam operations and spam
support services.
- Spamhaus Exploits Block List, spamhaus.org Lists
of IP blocks of Illegal 3rd party exploits, including proxies, worms and trojan exploits.
- SpamAssassin. Rule-based filter that uses header and
text analysis, as well as blacklists.
- Web Poison. To make it difficult for spammers who troll for email
addresses for our Web sites, I have also implimented a version of this in a responsible fashion.
Komuves Consulting Banned List
This is now maintained just to catch any miscellaneous spammers who
get past the other services we use. When spam is sent to one of our
users and reported, at a minimum, the mailserver that relayed the spam
is banned, or if the relay is a known large email provider
(hotmail.com, aol.com, yahoo.com, etc.)
the email address is banned. If the spam is generated from a
domain that specializes in spam, or if the domain is a repeat offender
and does not make an honest effort to eliminate spamming by it's users,
the offender's entire domain and/or IP block is banned.
Whenever an email address, domain, or IP block is placed onto our list
of banned sites, the site administrators of the banned site are
notified of the action, and given a chance to
appeal. If they make a good faith effort to
improve, and terminate the offending users' accounts, the ban will be lifted.
Send Email To Appeal An Existing Ban
Our banned list may be freely used by anyone who wants it. Here is a sample script that can be used to grab the latest
copy of our banned list. If you set it up as a cron job, please do not
download it any more than once per day, as that would be pointless.
If you do use it, please send email letting me know your domain name so
that it can be added to the participating domain list. The participating
domains that currently filter their email based on the list above are:
dungeoneer.com,
food.net,
kom.com,
landscapearchive.com,
martineschocolates.com,
poolsrv.com, and
thoughtrights.com.
Current List of Banned Sites/Rejection Messages
Other Recommended Spam Filters/Tools and Anti-Spam Sites
- postmaster.rfc-ignorant.org This is a list of sites
that do not have a Postmaster address as required by RFCs. If I were just running this mailserver
for myself, I would include use of this facility (which would exclude standards-violators like AOL).
AOL Violates Internet Standards by Eliminating Postmaster Address!
[Don't Click Here -- Sp_mmer Fodder]
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