Exchange 2003 & other possible equipment needed?

14 Mar 2006 10:05 PM

XTMAN

Hello,

My question is regarding Hosting multiple domains on 1 SBS 2k3 Exchange 2k3
server. This server is currently hosting 4 different companies and Domain
names. E-mail has worked fine (sending/receiving) for over a year now for
each of the domains. Since some of the ISPâ€™s have started to require a
Reverse DNS PTR record matching to a domain name we had a little trouble.
The current ISP we have will only allow one entry per domain name. I have
read that you can have multiple per IP but it still might not help per each
ISP we try and send to. So 1 of our domain has the reverse and all works
fine for that domain and here is my question. Do I need an IP for each of
the 4 domains and if so what is the best way to handle this
software/hardware. We currently have 1 Symantec Appliance as the router
connected to a T1. Do I need a separate router for each IP? What changes in
Exchange 2k3 might be needed?

Thanks.

14 Mar 2006 10:27 PM

Bharat Suneja

Haven't come across an ISP that looks up a PTR of a sending host and
requires it to match the sender hostname - as long as the IP has a PTR at
all that should work. (If that weren't the case, it wouldn't be possible to
host multiple domains on a single box).

If you have specific information to share - like which ISP rejects mail
based on the fact that sending host does not have a PTR that maps to a host
in the email sender's domain, please post.

--
Bharat Suneja
MCSE, MCT
www.zenprise.com
blog: www.suneja.com/blog
-----------------------------------------

Show quote

"XTMAN" <Jerry.Bog***@bdcon.com.(donotspam)> wrote in message
news:C9DFBFF7-DBDA-4452-B15D-299C911A38D4@microsoft.com...
> Hello,
>
> My question is regarding Hosting multiple domains on 1 SBS 2k3 Exchange
> 2k3
> server. This server is currently hosting 4 different companies and Domain
> names. E-mail has worked fine (sending/receiving) for over a year now for
> each of the domains. Since some of the ISP's have started to require a
> Reverse DNS PTR record matching to a domain name we had a little trouble.
> The current ISP we have will only allow one entry per domain name. I have
> read that you can have multiple per IP but it still might not help per
> each
> ISP we try and send to. So 1 of our domain has the reverse and all works
> fine for that domain and here is my question. Do I need an IP for each of
> the 4 domains and if so what is the best way to handle this
> software/hardware. We currently have 1 Symantec Appliance as the router
> connected to a T1. Do I need a separate router for each IP? What changes
> in
> Exchange 2k3 might be needed?
>
> Thanks.
>

15 Mar 2006 8:48 PM

XTMAN

Bharat,

I just spoke with the user and they sent the NDR's to me. Of the 4 domains
1 is listed as the RDNS. I was incorrect in my original statement. It does
not appear they are requiring the RDNS to match as you stated. Thank
goodness.

If ISPâ€™s do start requiring this would we have to have a separate exchange
server/public IP for each with itâ€™s own RDNS? Or are there any other
possibilities?

Thank you for your time.

Show quote

"Bharat Suneja" wrote:

> Haven't come across an ISP that looks up a PTR of a sending host and
> requires it to match the sender hostname - as long as the IP has a PTR at
> all that should work. (If that weren't the case, it wouldn't be possible to
> host multiple domains on a single box).
>
> If you have specific information to share - like which ISP rejects mail
> based on the fact that sending host does not have a PTR that maps to a host
> in the email sender's domain, please post.
> --
> Bharat Suneja
> MCSE, MCT
> www.zenprise.com
> blog: www.suneja.com/blog
> -----------------------------------------
>
>
> "XTMAN" <Jerry.Bog***@bdcon.com.(donotspam)> wrote in message
> news:C9DFBFF7-DBDA-4452-B15D-299C911A38D4@microsoft.com...
> > Hello,
> >
> > My question is regarding Hosting multiple domains on 1 SBS 2k3 Exchange
> > 2k3
> > server. This server is currently hosting 4 different companies and Domain
> > names. E-mail has worked fine (sending/receiving) for over a year now for
> > each of the domains. Since some of the ISP's have started to require a
> > Reverse DNS PTR record matching to a domain name we had a little trouble.
> > The current ISP we have will only allow one entry per domain name. I have
> > read that you can have multiple per IP but it still might not help per
> > each
> > ISP we try and send to. So 1 of our domain has the reverse and all works
> > fine for that domain and here is my question. Do I need an IP for each of
> > the 4 domains and if so what is the best way to handle this
> > software/hardware. We currently have 1 Symantec Appliance as the router
> > connected to a T1. Do I need a separate router for each IP? What changes
> > in
> > Exchange 2k3 might be needed?
> >
> > Thanks.
> >
>
>
>