Re: Reverse DNS for multiple mail domains on same server

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From: Victor Matei (rvf_at_bebe.moc)
Date: 03/09/04 

Date: Tue, 9 Mar 2004 15:12:39 -0500

On the subject of receiving mail servers performing reverse dns checking:
Is this efficient in preventing spam and if so how could this be
implemented in Exchange 2003?
Won't it stop some legitimate mail to get to your server ?

"Lanwench [MVP - Exchange]"
<lanwench@heybuddy.donotsendme.unsolicitedmail.atyahoo.com> wrote in message
news:%23ruUPrfBEHA.3524@TK2MSFTNGP10.phx.gbl...
> Since the Exchange server has only one host name, and one DNS name, and
> you're sending from the Exchange server, it should be fine in most cases
> unless the recipient server's admins are VERY picky. Frankly, a lot of
small
> clients I've worked with have PTRs that don't match the server's DNS name
at
> all - I think the presence of a PTR alone is enough in most cases.
> Corrections welcome!
>
> Victor Matei wrote:
> > I am trying to understand how to properly setup the PTR records for
> > our company's Exchange server.
> > From my understanding, there can be only one PTR record for a host
> > name, which is required to comply with the rdns check done by many
> > email systems. Example: nslookup for 3.0.168.192.in-addr.arpa would
> > return mail.dom-a.com So if someone@dom-b.com hosted on same server
> > sends mail, would it be rejected by recipients checking this ?
> > I need to know what exactly to ask the ISP to do for me.
>
>

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