How to Whitelist a domain or email address in Microsoft Exchange 2010

source: http://www.sbits.biz/how-to-whitelist-a-domain-or-email-address-in-microsoft-exchange-2010/

01/14/2013 — Russ

How to Whitelist a domain or email address in Microsoft Exchange 2010

Whitelist features are not available via Exchange Management Console (the GUI), so this will have to be completed via the Exchange Powershell
Open powershell via the exchange menu item and run one of the following scripts, based on your requirement:
To check whats currently whitelisted (Bypassed Recipients):

Get-ContentFilterConfig

To whitelist a single email address:

$list = (Get-ContentFilterConfig).BypassedSenders
$list.add("new.mail@address.com")
Set-ContentFilterConfig -BypassedSenders $list

To whitelist an entire domain:

 
$list = (Get-ContentFilterConfig).BypassedSenderDomains
$list.add("domain.com")
Set-ContentFilterConfig -BypassedSenderDomains $list

That's it!

source: http://www.sbits.biz/how-to-whitelist-a-domain-or-email-address-in-microsoft-exchange-2010/