Re: [anti-spam-wg] Domains with MX set to localhost
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From: der Mouse mouse@localhost
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Date: Wed, 11 Jan 2006 10:50:38 -0500 (EST)
>> [...blocking certain spammer domains...]
> We block a domain if:
> . the MX host is "." (following draft-delany-nullmx)
> . the MX host isn't a FQDN
> . the MX host has no associated A record at all
> . the A record of the MX record is localhost, RFC1918, link-local,
> class D/E, or a limited set of bogons (yes, I'm watching IANA
> allocations)
How is the second one possible? An MX record isn't capable of
containing anything *but* a FQDN. (Or does this really mean "MX hosts
in nonexistent top-level domains"?)
As for the third one - do you actually mean "address record", or do you
specifically not want to talk to people with IPv6-only MX hosts? Or do
you block only when *all* MX hosts are problematic? (I have my MX
record split; my MX is dual-stack, but when I had a single MX host with
both addresses, I ran into trouble with a sender who tried IPv6, got
rejected for no rDNS, and didn't try the IPv4 address of the same MX
host, so I split it into two MX records, naming different names with
only v4 and only v6 addresses, even though both addresses actually
reach the same machine.)
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