Glenn McCalley wrote:

Thanks Brian, that's already tonights project to run through those logs and
see if anything jumps out there.  What I think he might be doing is either
POSTing the parameters (which won't show up) or he's loaded a file of email
addresses and just triggers the mailer with a simple cgi request.  Either
way he's got to be calling sendmail or mail to get it out the door I
believe.

Actually, they can use a number of other ways to create the outbound SMTP connections. Perl, for instance, offers the Net::SMTP module (and numerous others that'd do the trick). They don't need to call on binaries outside of their own cgi-bin or leave any tracks for you other than a web access log entry.

You might consider putting your customers in jails with unique IP numbers as a way to better strain out whose CGI is the source of what packets on your network. Probably not a trivial change to your working environment, but maybe worth it in the long run.

--
Greg Barniskis, Computer Systems Integrator
South Central Library System (SCLS)
Library Interchange Network (LINK)
<gregb at scls.lib.wi.us>, (608) 266-6348
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