discard emails that are not addressed to non exchange accounts?

resolver1
resolver1 used Ask the Experts™
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how do i discard emails that are addressed to non exchange accounts?

or to put another way: If the addressee does not have a exchange mailbox or alias i want to discard the email.
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Alan HardistyCo-Owner
Top Expert 2011

Commented:
You need to enable Recipient Filtering.

What version of Exchange do you have?

Exchange 2003:
http://www.msexchange.org/tutorials/sender-recipient-filtering.html

Exchange 2007:
http://technet.microsoft.com/en-us/library/aa998898(EXCHG.80).aspx

Exchange 2010:
http://technet.microsoft.com/en-us/library/bb125187.aspx

Author

Commented:
Sorry I should have put the Exchange version.

We using Windows 2008 SBS server which is Exchange 2007.  Do we have a edge server? We only have one sbs server which has exchange installed.  We dont have Exchange is not installed on a machine on the  perimeter of our networks, we use a device called netpilot which is a firewall/forwards all SMTP traffic to exchange on the sbs server.
Co-Owner
Top Expert 2011
Commented:
Okay - with SBS you have the Anti-Spam already installed, so you just need to run the following command to make sure Recipient Filtering is enabled (from the Exchange management Shell):

Set-RecipientFilterConfig -RecipientValidationEnabled:$true
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Author

Commented:
Type in get-RecipientFilterConfig and RecipientValidationEnabled is set to true.  Brilliant.  Thanks for your help :-)

I didn't realise AntiSpam filtering is enabled.  Is there any recommended tweaks for the default setup?
Alan HardistyCo-Owner
Top Expert 2011

Commented:
My recommendation is to disable them all and install Vamsoft ORF (http://www.vamsoft.com/) - but then that's a personal view.  I am not a fan of the built-in tools.  Very inflexible and good at losing good mail.

Author

Commented:
Thanks alot.  you've been a great help!
Alan HardistyCo-Owner
Top Expert 2011

Commented:
You are welcome.  Try the built-in tools and if you get very frustrated - give Vamsoft a 30-day Trial - you may just love it as I do.  Not bad piece of software for $239 per server (one off cost - $99 to renew it if you choose to - if you don't - it will continue to work).

Author

Commented:
We have being considering a cloud spam filtering service like message labs.  I'm in the process of comparing cloud services vs internal.  So Vamsoft will come in handy in the investigation.  

Thanks.
Alan HardistyCo-Owner
Top Expert 2011

Commented:
Sounds sensible.  My input to that is that the Cloud may not be in your control 100% - whereas Vamsoft is.  It currently either allows or Rejects mail - there is no quarantine (but coming in the next version).

It does an incredible job for a 4Mb download and has had some spectacular results:

http://blog.sembee.co.uk/post/Truly-Spectacular-Results-from-Vamsoft-ORF.aspx

Considering the cost (per server) and the usual cost of Cloud services (probably per user), it packs a mighty punch.

Author

Commented:
Thanks for your help.

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