With today's spam filters getting more militant, it is up to us to make sure that our SBS based Exchange servers and the DNS associated with them are absolutely correct.
Many anti-spam filters will not send out an NDR - Non Delivery Report - to let the sender know that something is amiss.
How about a phone call from a client saying something to the order of, "We have a client that we can't seem to send e-mail to. Please fix it!"
After verifying all of the settings being correct, or at least seemingly correct, another call comes in a while later by the same client stating that e-mail is not getting through again.
Sometimes, it is someone on the other end who has incorrectly setup some sort of anti-spam appliance. We were in that situation. The call came through, and we know that our settings were correct, so it must be the other side's issue. It turns out that their IT department had installed this anti-spam appliance a number of months ago and since then many board members were no longer able to receive a lot of their email. Ouch!
For us, there is no excuse for an incorrectly setup Exchange server on SBS. The tools are available for us to make sure everything is correct.
To verify your client's DNS for email go here: DNSStuff and run the DNSReport. You will be surprised what you may find there. Kewl thing about this tool? It provides all of the relevant fix information too.
So, get it done. And, if you are dealing with a less than cooperative ISP, then counsel the client into a 3rd party email hosting setup for your SBS email redundancy. Exchange hosting might be an option in this case.
Microsoft Small Business Specialists
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