Bug 1402 - MX lookups IPs matching to sending email address
Summary: MX lookups IPs matching to sending email address
Status: RESOLVED WONTFIX
Alias: None
Product: Spamassassin
Classification: Unclassified
Component: spamassassin (show other bugs)
Version: 2.43
Hardware: Other other
: P2 enhancement
Target Milestone: 2.60
Assignee: SpamAssassin Developer Mailing List
URL:
Whiteboard:
Keywords: dns
Depends on:
Blocks:
 
Reported: 2003-01-22 10:41 UTC by Jason Portwood
Modified: 2003-05-25 14:54 UTC (History)
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Description Jason Portwood 2003-01-22 10:41:26 UTC 
A header has the received lines and the from.  Could a test be performed on the 
from to do an MX lookup.  Then that result could be tested against all the 
servers listed in the received lines.  If it matches with the MX's then the 
message could be given a negative (or nothing).  If it doesn't then it could be 
given a positive.  I'd even go as far as saying if it matches within the same 
Class C subnet (or B) it should go be given the negative.

exemptions for hotmail and other multi-pop mail hosters as well.
Comment 1 Theo Van Dinter 2003-05-25 22:54:23 UTC 
it doesn't necessarily follow that incoming and outgoing mail servers are the 
same.  for instance, at work the outgoing mail server is an exchange box on 
one network, and the incoming mail server is a solaris box on a different 
network.  they communicate via private frame relay, and so there are no mx 
records pointing at the exchange box.