why change remote.domain.com mx record

There might be 3 reasons:
a. If the resulting IP changes and they didn't change ISP (for example) then they want to receive mail on another server.
b. If the resulting IP changes and they changed ISP then they need to change the IP in order to continue receiving mail on the same server.
c. If the resulting IP DOESN'T change then they might want to clear out their naming convention.

Hello,

Its probably so that Exchange passes the reverse DNS checks.

it might be the reason he wants his email delivery process done  internally within
its organization.

Take a look at this article
http://smtp25.blogspot.hk/2007/07/can-you-run-mail-server-without-mx.html

Hope understand your question completely, if not , please point it out


Duncan

Could be few reasons:

1. SSL Certificate
2. Redundancy (multiple MX records)
3. 1 less DNS record to worry about.
4. Reverse DNS (spam check)as Scorpeo says.
5. The IT guy likes messing with you!!

Thanks guys,

the mail.domain.com is pointing to IP A
with MX record pointing to this server as its the mail server


whilst remote.domain.com has been changed to point to IP
with the mx pointing to this server.

regarding the answers;

1. SSL Cert? Why would pointing the MX record back here help with this please?

2. Redundancy - Again why would this be the case?

4. Reverse DNS I Can see why but this is not the mail server?

Thanks in advance guys.

"2 - It wouldn't truely be redundant.  The record would but if its pointing to the same place so wouldn't help in the event of their server being down."

Not necessarily, could be multiple mail servers behind that IP with the firewall deciding which to deliver too.


Is the mail server an exchange box ?

@Donnk - Good point, I hadn't thought of that.

the mail server on mail.domain.com and IP a is a SBS running an exchange mail server and handling all of the sites mail.

I'm not sure what the secondary site could be. The SSL would make sense if the remote wasn't pointing to the second IP.

Scorpeo, regarding point 3 - what use would haveing an mx record setup for a web server hold?

many thanks guys.