Am 09.11.2006 um 15:40 schrieb Jim Maul:
I think pretty much everyone understand WHY people use these BLs.
This is not the point. The point is, its not a very good solution.
If you have 100gb of data you need to back up every day and you
only have 50gb worth of tapes to back that data up onto, would you
only back up half of it and trust that your hardware wont fail?
This is essentially what you are doing.
The CORRECT solution to the problem is to buy more tapes. Just
like a better solution to your problem is to buy more machines to
process the mail, not trust someone else to tell you who should and
shouldnt be able to send mail to your server. FPs WILL happen. If
you havent seen any yet, great, but be damn sure you will at some
point.
I understand that this can get incredibly expensive and this is
most likely why people use BLs at all, but that does *not* mean
that rejecting mail based on these lists is by any means the
solution to the problem.
Recently was a victim of being on a blacklist for two different
German ISPs (eplus.de and hansenet.de)! This was particularly ironic
because I connect to one mail server via SSL but it was rejecting my
connection because my IP was blacklisted! So we had to implement a
whitelist on top of the blacklist and then remove the line in the e-
mail with my actual IP address so that the mail doesn't subsequently
get blacklisted! And I'm sure any spammer worth their salt knows how
to do exactly the same.
Spam coming from botnets, etc. needs to dealt with by the ISPs. In
Germany the law is now that you are liable for abuse carried out on
your network, ie. someone hacks your box or more likely WLAN then you
are still liable.
Charlie
--
Charlie Clark
Helmholtzstr. 20
Düsseldorf
D- 40215
Tel: +49-211-938-5360
GSM: +49-178-782-6226
