On Mon Dec 10, 2001 at 09:57:24AM -0500, Pierre Fortin wrote: > > I've been thinking about something for a little while now and I was wondering if >anyone here on the list has Postfix installed and doing reverse lookups as a method >of controling the amount of SPAM coming into their mailservers. > > Yes. There are problems though in that I have to allow certain hosts to send me > mail regardless because some legit sites either don't have a reverse mapping, or > have it wrong... It appears that Mandrake may have fixed their DNS entries so > that 216.71.84.35 returns only mandrakesoft.mandrakesoft.com instead of 3 > hostnames of which only one was mapped back. This was causing postfix to reject > about 2/3's of the messages sent to me. > > Even with this feature enabled, I find that some spam is still getting through > because the intermediate hosts can be reverse looked up. I have to add these > spammers to my "header_checks" file... I plan to have a look at > http://www.spambouncer.org for other options. > > I have also enabled "recipient_delimiter = +" and am changing my IDs at the > various sites I use to clearly identify which sites are either selling or > leaking my address...
Funny that this is mentioned... there is an article about SPAM on MandrakeSecure that discusses exactly what you're saying, Pierre... =) http://www.mandrakesecure.net/en/docs/spam.php -- OpenPGP key available on www.keyserver.net 1024D/FE6F2AFD 88D8 0D23 8D4B 3407 5BD7 66F9 2043 D0E5 FE6F 2AFD Current Linux kernel 2.4.8-34.1mdk uptime: 20 days 21 hours 0 minutes.
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