MX record lookup sequence?

[Mark.Andrews at nominum.com]

	Ray, don't post from fake email addresses.  This newgroup is
	gatewayed with a mailing list and it just annoys the people
	who you want to help you.  It also slow up any reply as it
	has to wieve its way back.

	This is better addressed in you mailer's configuration than
	in the DNS.  I havn't seen a mailer that didn't allow you
	to send particular mail direct to a particular address ignoring
	the MX records.

	Mark

> 
> Hi,
> 
> When an MX record is looked up, does anyone know how many queries it
> requires? For example, are the preference and the actual IP address
> returned in one lookup or is a second lookup needed to resolve the mail
> server name to its IP address?
> 
> I need to have a particular server send all email going to a particular
> domain to a different IP address than the one specified in the MX record
> for that domain. If it takes a second query to get the IP address, I
> figure I could put in a HOSTS file entry to point the mail server name
> in the MX record to the IP address in the HOSTS file.
> 
> MX record: smtp.mydomain.com 123.123.123.123
> 
> HOSTS entry:  222.222.222.222   smtp.mydomain.com
> 
> Any ideas as to whether this will work or any other suggestions on how
> to accomplish this will be greatly appreciated!
> 
> Thanks,
> 
> Ray
> 
--
Mark Andrews, Nominum Inc.
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark.Andrews at nominum.com