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Posted to commits@spamassassin.apache.org by Apache Wiki <wi...@apache.org> on 2007/07/23 09:27:43 UTC
[Spamassassin Wiki] Trivial Update of "OtherTricks" by JeremyKister
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The following page has been changed by JeremyKister:
http://wiki.apache.org/spamassassin/OtherTricks
The comment on the change is:
fixed domain.com -> example.com
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Fake MX records can work like greylisting and often much faster. It doesn't require the installation of new software. What you do is add a fake highest and lowest MX record. Normal email will probably retry but spammers often don't. This is especially true of virus infected windows zombie spam. Here's an example MX configuration.
{{{
- fake0.domain.com 10
+ fake0.example.com 10
- realmx.domain.com 20
+ realmx.example.com 20
- fake1.domain.com 30
+ fake1.example.com 30
}}}
The fake records can either be undefined or can point to dead IP addresses or to real IP addresses with port 25 closed. On the lowest numbered MX be sure it's pointed to a closed port because if you just use a temporary error then Qmail, which is not RFC compatible, will never move up to the next MX record.
@@ -28, +28 @@
Optionally you can add a lot of fake MX records on the top side. Additional fake MX records on the lowest numbers end will cause some additional delay, but on the high end there's no penalty. The reason for additional higher MX records is if spammers start trying random MX records then this give them more dead MX records to try.
{{{
- fake0.domain.com 10
+ fake0.example.com 10
- realmx.domain.com 20
+ realmx.example.com 20
- fake1.domain.com 30
+ fake1.example.com 30
- fake2.domain.com 40
+ fake2.example.com 40
- fake3.domain.com 50
+ fake3.example.com 50
- fake4.domain.com 60
+ fake4.example.com 60
- fake5.domain.com 70
+ fake5.example.com 70
}}}
== Greylisting ==