On Apr 15, 2004, at 05:51, Philip Hazel wrote:
> ibase.com. MX 20 mailhost.ibase.com.
> ibase.com. MX 30 inbound.firstnet.net.uk.
> ibase.com. MX 55 relay.firstnet.net.uk.
> ibase.com. MX 666 non-mail.ibase.com.
> ibase.com. MX 10 mail.ibase.com.
> mail.ibase.com. A 62.105.94.141
> mailhost.ibase.com. A 62.105.94.141
> non-mail.ibase.com. A 127.0.0.1
> inbound.firstnet.net.uk. A 212.103.224.21
> relay.firstnet.net.uk. A 212.103.224.41
>
> [...]
> And finally, to satisfy my curiosity: what on earth do you suppose the
> above set of records is supposed to achieve?
Wild, wild guess.
Spammers often look for the highest-numbered MX.
Legitimate MTAs try all available MXes in increasing order, so the
likelyhood of getting to 666 is near non-existent (provided that the
other servers above have a cumulative 100% uptime).
-tor
