Posted by The Natural Philosopher on 12/29/07 09:33

mp- wrote:
> On Dec 28, 5:56 pm, Iv�n S�nchez Ortega <ivansanchez-...@rroba-
> escomposlinux.-.punto.-.org> wrote:
>> The Natural Philosopher wrote:
>>> take the domain part of their address and try looking for MX, then A
>>> records..and hope their ISP doesn't have a relay in the way..
>> ... And do a port scan on pop3.domain, and imap.domain, and do keep a
>> whitelist of known domains and servers (together with a manual way of
>> adding a domain+server to that whitelist).
>>
>> --
>> ----------------------------------
>> Iv�n S�nchez Ortega -ivansanchez-algarroba-escomposlinux-punto-org-
>>
>> Why was God able to create the universe in only seven days? Because he
>> didn't have an installed base to deal with.
>
>
>
> Doing a port scan on imap.domain.com, pop.domain.com, etc.. just seems
> like taking an educated guess as to what the IMAP/POP3 server name
> is.
>
> Does a DNS record exist describing the hostname for a particular
> domains IMAP/POP3 servers? It seems that the MX record is only for
> SMTP - which doesn't necessarily mean IMAP/POP3 is on that same
> machine.

MX is the target for publically recievable mail. It may, or may not be,
on the same machine.


For small domains it usually is.

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