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Article: 2017
From: Anthony Howe
Date: 2009-05-20 23:57:19 -0400
Subject: Re: Proof of concept Email Black List.

Removal...........: milters-request@milter.info?subject=remove
More information..: http://www.milter.info/#Support
--------------------------------------------------------

Skull uttered...:
>> How is an Email Black List used by milter-link?
> 
> milter-link extracts email addresses from message header/body, than  
> does a DNS lookup to see if each address's MD5 is listed by  
> configured DNSBLs.

It tests MAIL FROM:, From:, Reply-To:, and email addresses found in the
body content. The MAIL FROM: is checked at RCPT TO: time so that
recipient white listing can be applied if desired.

Additional headers to check can be specified, but currently the
listed.emailbl.me is limiting the email addresses the extract from the
headers.

BarricadeMX stats on my server

214-2.0.0 age=214488 (02 11:34:48)

214-2.0.0 058 MAIL=39095 100.00%; 421 100.00%; 473 100.00%
214-2.0.0 080 mail-bl-mail=103 0.26%; 1 0.24%; 1 0.21%

214-2.0.0 127 MESSAGES=5490 100.00%; 58 100.00%; 75 100.00%
214-2.0.0 161 mail-bl-hdr=9 0.16%; 0 0.00%; 0 0.00%
214-2.0.0 162 mail-bl-body=3 0.05%; 0 0.00%; 0 0.00%

Note the above stats are influenced by the DNS-BL and URI-BL and other
tests that are also running on this production mail server. Therefore
there is probably a lot of overlap. Disabling some earlier tests might
show higher numbers.

BarricadeMX stats on the spam trap

214-2.0.0 age=214511 (02 11:35:11)

214-2.0.0 058 MAIL=53224 100.00%; 421 100.00%; 494 100.00%
214-2.0.0 080 mail-bl-mail=229 0.43%; 0 0.00%; 0 0.00%

214-2.0.0 127 MESSAGES=33523 100.00%; 322 100.00%; 383 100.00%
214-2.0.0 161 mail-bl-hdr=9 0.16%; 0 0.00%; 0 0.00%
214-2.0.0 162 mail-bl-body=3 0.05%; 0 0.00%; 0 0.00%

Here the DNS-BL is off.

-- 
Anthony C Howe            Skype: SirWumpus                  SnertSoft
+33 6 11 89 73 78       Twitter: SirWumpus      BarricadeMX & Milters
http://snert.com/      http://nanozen.info/     http://snertsoft.com/

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