>Date: Thu, 11 Dec 1997 11:20:25 -0600
>From: Patrick Larkin Jr <>
>Subject: Spam Relay Blocks
>I've honestly not done all my research, but that's cause I'm too busy
>dealing with complaints to "postmaster" at my domain.... <sigh>
>Reader's Digest version: We are using Gauntlet 3.2 from TIS. Spammers
>are abusing our SMTP (smap) and using us as a third-party-relay. I know
>that Sendmail v8 has some anti-spam mechanisms and Trusted Information
>Systems claims they will too in early 1998. Sadly, assuming their
>release is on schedule (and what software company ever is), we cannot wait
>that long (we've been "hit" several times in the past few weeks).
>Repeated attempts at obtaining suggested temporary workarounds
>from TRUSTED INFORMATION SYSTEMS have only resulted in their canned
>"here's how to block connects to your SMTP port based upon IP-address
>or Domain-name" which is worse than useless. [It's a shame Ranum's
>no longer there.]
Yes the latest version of sendmail included with Red Hat 5.0 included
a anti - spam wrapper. The sendmail release is 22.214.171.124 which by now is
probably not the latest rev. Hope this is some help. Also look into
qmail which has some good benefits:')
>Anyway, my questions for you experts are:
>Is there a "patched" version of 'smap' (lifted from the Firewall Toolkit
>source) floating around that will drop in to replace the Gauntlet 'smap'
>that thwarts relaying? Any problems/warnings/successes with it?
>Alternatively, is there a semi-safe way to put 'sendmail v8' in front
>of smap (so that we at least do not degrade its security) such that v8's
>anti-relay mechanisms can be used? If so, can you supply a synopsys of
>what you did, how well it worked, and any pitfalls to avoid? Finally,
>as a last resort, any comments whether I should abandon 'smap' altogether
>and put sendmail v8 in place?
>Please reply via Email - my Usenet time is limitted now.
>I'll post a summary soon.
> Patrick Larkin Jr <plarkin @
com> Unix Evangelist and Administrator
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