delete items from the arbitration mailbox

We have transport rules which flag emails based on keyword and sends them to a moderator.  A crude sort of SPAM filter if you will.  However we would like when rejecting moderated messages that no rejection notice is sent to the sender.  I was thinking I would probably need to go into the arbitration mailbox and delete the items before the moderation time expires as Exchange seems to send the notice no matter what.  

Was looking for tips on how to easily do this (go in and delete items or otherwise prevent a reject notice from being sent).  

Perhaps setting up another rule to delete the rejection message?
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Will SzymkowskiSenior Solution ArchitectCommented:
Transport rule although helpful in certain situations, are not a good method for tracking spam etc. That being said you cannot use Moderation and Delete Message Transport rules together. You need to do either one or the other.

The only suggestion I can give you would be instead of using moderation, have the message forward to an Admin mailbox, then Send As the original user to the recipient. This obviously has manual steps but it mitigates the auto reply.

Or you can simply drop/delete the message rather then using moderation.

As stated before Transport Rules do have some limitations.

Will SzymkowskiSenior Solution ArchitectCommented:
I actually just came across another setting in Exchange 2010. On an individual mailbox there is an attribute called SendModerationNotifications but default this is set to "always".

The options for this setting are...

You could set this on one mailbox and test its concept to see if it works with your Transport Rule. If it does then you can do it for all users in your environment if that is what you want to do.

Use the below script to change this setting for one user.
Get-Mailbox -Identity <alias> | Set-Mailbox -SendModerationNotifications Never

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If you wanted to do this for all mailboxes in your environment you can use the below command.
Get-Mailbox -ResultSize "Unlimited" | Set-Mailbox -SendModerationNotifications Never

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