[CentOS] Postfix / Postini question

Marc Powell
Wed, 29 Jun 2005 15:07:05 -0000

> -----Original Message-----
> From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On
> Behalf Of Barry Brimer
> Sent: Wednesday, June 29, 2005 9:47 AM
> To: centos at centos.org
> Subject: [CentOS] Postfix / Postini question
>
>
>
> I have a mail server that handles several domains.  One of these
domains
> has
> decided to use Postini.  For those not familiar with Postini, you set
your
> MX
> records to use their mail servers.  They filter mail, and deliver you
only
> the
> clean virus/spam free mail.  The idea is to only allow incoming mail
from
> their
> mail servers so spammers are unable to send to your mail server
directly.
> This
> is fairly simple to do with standard restriction classes for a
dedicated
> mail
> server.  I am not sure how to accomplish this on a shared mail server.
> Ideally
> I would like to instruct postfix to accept mail from anywhere for all
> domains
> except one domain (the one using Postini) and only allow mail destined
for
> that
> specific domain to originate from Postini's mail servers.  Any ideas
would
> be
> greatly appreciated.


I'm not a postfix guru but I don't believe that is possible with a
shared server. However, it's been my experience that if your server is
not listed as an MX (and it won't), MXs exist (and they will --
Postini's) then mail will not be delivered to your machine by anyone
except Postini. The only two scenarios I am aware of in which mail would
get delivered to your server instead of Postini's would be if a) you
were listed as a fallback MX or b) no MX's were specified then the A
record for your domain would be used.

Have you looked through the postfix wiki, documentation, faq, mailing
list, etc? That'd be the first place I'd go since they _are_ the postfix
experts ;).

--
Marc