Re: [Exim] @mx_any and 127.0.0.1

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Autor: Tor Slettnes
Data:  
Para: Philip Hazel
CC: exim-users
Assunto: Re: [Exim] @mx_any and 127.0.0.1
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