Re: How do you handle reverse DNS names for two email domain names

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Wow. That never even crossed my mind, but makes sense now.

Thank you for clarifying it!

Gregg Hill



"Marina Roos [SBS-MVP]" <marina@xxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:%23KOD4bT5HHA.5724@xxxxxxxxxxxxxxxxxxxxxxx
No Gregg, You can't have two mx records pointing to the same IP for 1
domain.
Each domain needs to have the MX pointing to the same public IP of the SBS
server. And the name of that MX record should be the same for both
domains.

So if the MX for the first domain example.biz was setup with
mail.domain.com 123.123.123.123

The second domain example.org will have exactly the same MX record:
mail.domain.com 123.123.123.123

The name mail.domain.com doesn't really matter at all and can be about
anything. As long as that name is pointing to the right public IP
123.123.123.123.



--
Regards,

Marina Roos
Microsoft SBS-MVP
One of the Magical M&M's
www.smallbizserver.net
Take part in SBS forum:
http://www.smallbizserver.net/Default.aspx?tabid=53

"Gregg Hill" <bogus@xxxxxxxxxxx> schreef in bericht
news:OatKLRT5HHA.4584@xxxxxxxxxxxxxxxxxxxxxxx
I am not certain, but would the second IP even be needed? Wouldn't you
just
be able to have your ISP set up a second PTR record for the second domain
name, and have it point to the same IP as the first mail server name?

For example,

mail.yourdomain1.com = IP address
mail.yourdomain2.com = same IP address as above

Just a thought. I'd love to know how it will work, since I am about to do
exactly the same thing.

Gregg Hill


"DrJonz" <DrJonz@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:8F661E09-7830-4251-8428-B3A6ABE23A7F@xxxxxxxxxxxxxxxx
I'm that far already. But if I leave it like this and set a user to to
use
the second email as primary, won't the receiving server check the
reverse
DNS
and see the name of the first email domain name and block it as spam?

"Marina Roos [SBS-MVP]" wrote:

Hi,

You don't need a second public IP for that other domain at all. You
also
don't need to change the reverse DNS. Simply point the MX record for
that
second domain to the public IP of your server. Add the email domain in
the
Recipient Policy.
If a user needs to be able to have that second domain as primary,
uncheck
the 'Automatic update recipient policy' in the properties of that
user.

--
Regards,

Marina Roos
Microsoft SBS-MVP
One of the Magical M&M's
www.smallbizserver.net
Take part in SBS forum:
http://www.smallbizserver.net/Default.aspx?tabid=53

"DrJonz" <DrJonz@xxxxxxxxxxxxxxxxxxxxxxxxx> schreef in bericht
news:10339EBB-D5AB-4232-91AA-A821B5BD472C@xxxxxxxxxxxxxxxx
Customer needs a second email domain name which I have configured in
Exchange. They can receive mail fine on the second name. But for
users
to
reply using that name, I need to setup a second IP mated to a
reverse
DNS
name matching this second email domain or else they'll get lots of
bounce
backs.

I currently have the SBS server with one NIC behind a router which
forwards
MX to it. From this point, I don't know how to get the 2nd IP in
the
mix.
I
was thinking of a dual WAN router but even then, the server would
reply
over
its gateway and 1st reverse DNS name.

Thoughts?









.

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