http://bugzilla.spamassassin.org/show_bug.cgi?id=3357
Summary: Check for Web sites whose MX records point to loopback
Product: Spamassassin
Version: unspecified
Platform: All
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P5
Component: Rules
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
I've recently received a number of spams (mostly pharma) coming from domains
with wildcard MX records pointing to 127.0.0.1.
Very few legitimate people/organizations/companies would give loopback as their
mail server's address, but many spammers do this, presumably to try to make it
harder to report them.
Perhaps a rule could be added (for network configurations only, of course) to
check for this ... though it might also not be a great idea due to the
potentially high cost of all the DNS lookups it would require.
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