[CentOS] company exchange server & exim best practices.

Scott Silva ssilva at sgvwater.com
Fri Apr 3 21:32:15 UTC 2009

on 4-3-2009 12:40 AM Rudi Ahlers spake the following:
> Hi all,
> I hope this isn't too OT, but since I use a CentOS5.2 + Exim mail
> server (which is hosted in one of our data centres) I don't think it
> should be.
> On of our clients use an MS Exchange 2003 SBS server, with exchange
> for their internal email. We provide them with a domain, ADSL (which
> uses dynamic DNS) and POP3 email. They don't have an spam filter
> program on the exchange server itself due to costs, so I have setup
> each user on the Exim server, which runs ASSPX for anti-virus / spam
> filter / etc. Then I setup the SBS 2003 server to pull the email via
> POP3, but this doesn't seem to work too well, cause the exchange
> server doesn't always download the POP3 email, and then the users
> often sit without email until I go there to manually download the mail
> again.
> I have tried changing the MX record to point to their DynDNS address,
> and it works well, but then they get a lot of spam. And the cost of a
> server-side spam solution is just too expensive, and they also pay for
> the bandwidth uses when spam comes in. So, I moved their MX record
> back to the Linux server. But now I sit with the problem of the POP3
> connector failing from time to time.
> So, I would like to know, is there a way to "push" (not forward) mail
> from the Linux server, after it has arrived and spam been blocked, to
> another domain, but with the same email address? i.e. the domain in
> question is attorneys.co.za and I've setup attorneys.dyndns.net as the
> dynamic domain, but the exchange serves email for attorneys.co.za
> Forwarding email doesn't work, since there's no such user as
> bob at attorneys.dyndns.net, but rather bob-cXiXO26w8qUnikiFv2/1gg at public.gmane.org
I use MailScanner. It can be set up on your gateway, integrates with exim very
well, and can virus scan as well as spam scan.

and for howtos


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