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From: Terry Carmen (terrycnysupport.com)
Date: Wed Jul 08 2009 - 13:03:46 CDT
> Hi guys. I've been googling around looking for info on this without much
> sucess. Here we are: Some of my customers insist on sending bulk-email
> from their web php sites (you know, bulletins and such). My worst
> nightmare would be having our servers listed in any RBL list because of
> this. How do you guys deal with custommers sending bulk-mail? Are there
> any rules in postfix to prevent it, maybe even delaying them in the queue?
Unfortunately, this is a human problem, not a technology problem.
There are various "band-aid" approaches, like running the outbound mail
through spamassassin and HOLDing the "spammy" mail, however this may or may
not catch what you want, since even SpamAssassin has no idea if the user
actually wanted the mail or not.
I worked for a very large ISP a number of years ago, and they handled the
problem with a good legal team and really good contract that specified huge
financial penalties for spamming. This actually worked very well, since the
customers would either refrain from spamming, or would be terminated, forfeit
their hardware and be sued.
You might want to do the same, as well as suggest that your customers use an
outside mailing-list provider.
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