It seems we're being hit with lots, and lots of NDR's. I would like to implement recipeient filtering on a W2k/Exchange2k Server. Incoming mail to the domain first goes through a SPAM filter which relies on a seperate server. From there, if it passes all rules/etc, it's passed onto the exchange server. The problem is, the SPAM filter does not support AD Recipient Filtering. Outbound mail goes out through the exchange server. I've noticed recently that the SMTP queues on the exchange server get a ton of NDR's for "Junk" domains.
What are my options for recipient filtering? I don't really need something too pricey that also acts as a spam filter/100 other gadgets...any help is appreciated.
The option that I saw that looks to be best is ORF Enterprise Edition, is this so? Relatively easy to use? Should it be installed on the exchange server, or the current Spam filter? Will it intefere with the current SPAM filter (CMS's G2)