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Microsoft Exchange SPAM filtering

Hi please could someone advise me on a good Microsoft Exchange SPAM filtering solution. We seem to get allot coming into particular accounts. we have don't what we think is possible within the exchange software itself but was wondeing what is the best bolt on software or online solution available.
1 Solution
We use PureMessage by Sophos. It takes care of our needs pretty well in a 150+ mailbox environment. Or you might want to check out a 3rd party spam filter company. You can route all your mail through them for filtering and then you don't have to do it on the server and it will save your network and server a lot of traffic.
Are you looking at the IMF in Exchange 2003 or the AntiSpam systems in Exchange 2007.
A good RBL is going to blick 90%+ of SPAM and tightening up the other rules can give greater than 97% coverage, so all in all, there not bad!
Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
Version of exchange?

If 2003, enable IMF and smtp tarpitting.

In 2007, install antispam agents on the hub, if you don't have an edge and configure the agents properly.
I use GFI MailDefense Suite and it is very effective at removing spam/email viruses.  The price isn't bad either considering it is almost impossible to find, let alone manage, individual subscriptions that are locally installed on the users PCs.

Good luck in your fight man it is uphill all the way.  Job security right?  Just kidding I would rather be developing and testing than fighting this crap.

Let me know if you have more questions.
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