MX records and multiple IP addresses

[Michael Voight]

"Keller, Richard (CIT)" wrote:
> 
> We have a client who is requesting the following:
> 
> They currently have an email server with an MX record pointing back to it.  So
> let's say the record is mailserver.nih.gov. IN MX 10 mailserver.nih.gov.  They
> wish to have another email server, mailserver2.nih.gov, that will be on the same
> IP address, but will be used for IIS web access to exchange.
> 
> If they are registering mailserver2.nih.gov to the same IP address as
> mailserver.nih.gov will it need another MX record that points to mailserver2?
> In other words, mailserver2.nih.gov. IN MX 10 mailserver2.nih.gov.  Or, should
> the MX record point back to mailserver.nih.gov.

Will it need another record? Probably not, as it could simple get mail
based on the A record. Do you want another record? Yes, two names = 2 MX
records.

> 
> In addition, will multiple MX records on the same IP address cause any kind of
> problems routing e-mail or with name resolution?

No. You can have mail bound for multiple hostnames/domains get sent to a
single mail server.

Michael