<quote who="CertaintyTech - Ed Henderson">
> This question is not SA specific but just a general email sysadmin type
> question: What is an effective way to monitor my own dialup customers
> to see if any are abusing their email privilege by sending out spam? I
> am using qmail. Somehow monitor the volume that each local IP is
> sending? Just curious to see what others are using and how you do it.
Short answer: nothing works.
Long answer: without putting in place arbitrary and silly limiting
software (no more than 100 SMTP connections a day, no more than 5
addresses) etc. A determied user on your dialup can send spam. The silly
and arbitrary rules will make your life MUCH harder. ("What do you mean I
can't send my party notice to all 22 of my firends?")
If you block access to port 25 from you DUL like some of the large ISPs
doat least you will have a record on your server of the spam, but you
limit your users and place a larger burnden on your own SMTP.
The only thing that has worked (I don't run an ISP myself, but I have
firends who do) is draconian anti-spam rules in the TOS. $50 per spam
that is sent. Action on any spamming is swift and sure. All acounts are
on EFT too, iirc. they did make $11,000 dollars in 2 days off a (very
stupid) new account that immediately sent out 2.1 million spams. There
was only $11,000 in the EFT account.
However, unlike the big ISPs they do take the time to ensure the suppsoed
spam is, in fact, spam. You'd be surprised (or not?) how often someone
signs up for info from a web site and then forgets. 6 mnths later when
they get a "Hey, we've updated our pages and added some products" they
throw a tizy fit about being "spammed." On the other hand, 2.1 million
messages can mean only one thing...
--
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