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how to separate my inbound and outbound email

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Zen216

MIS
Jul 13, 2006
616
US
Hello,
Currently our mail setup is on an exchange 2003 server, that relays all mail though a IIS6 SMTP virtual server. that IIS SMTP server has our spam filter on it, and all mail flows through it,,,

on the outbound route, all the spam software is doing, is putting a disclaimer on our email.

Our server is starting to get bogged down, and I was thinking of setting up another IIS6 relay on my network for my outbound traffic, and get a cheap disclaimer product.

I am pretty confident on getting exchange to relay mail through the new server, but I do not know what I need to do to make sure my email gets accepted by others,, What records (MX etc..) need to be updated with my ISP?

In the past, when the spam server got too bogged down, I would let exchange just send the mail directly out, and bypass the spam filter (no disclaimer),, but some would get bounced back, since it came from a different IP than what my servers are normally on..

Thank You..
 
Additional MX record for the other server should be all you need unless you are defining an SPF as well.

Give the additional server a higher MX cost than the original so inbound mail will prefer the older one.

Just be careful since in a lot of cases spammers will send to MX records with higher costs in case they are less well protected than the primary relays.
i.e. Make sure you keep them both up to date security wise.

Neill

p.s. Why not do the disclaimer on Exchange itself? There are SMTP event sink products for around the $100 mark if you are using a single domain name.
 
If it's only outbound, MX record changes won't matter. Make sure the reverse DNS for that 2nd IP address is correct. It can be the same as what the primary address is.

Link ntinlin mentions, if you're publishing SPF records, check those.

Pat Richard MVP
Plan for performance, and capacity takes care of itself. Plan for capacity, and suffer poor performance.
 
thank you both. That is what I was wondering. I am also looking at some disclaimer products.

Thanks again
 
exclaimer is a good one. But that functionality is also built into Exchange 2007 and Exchange 2010. Time to upgrade! :)

Pat Richard MVP
Plan for performance, and capacity takes care of itself. Plan for capacity, and suffer poor performance.
 
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