This is a snip from the Exchange 5.5 SP1 release notes:
- Open Admin.exe.
- Select the Connections tab.
- In Accept Connections, choose Message Filtering.
- In Prevent these domains and users, choose Add.
- Type the name of the domain and user you want to prevent from delivering messages to your site.
- To save and automatically, move messages from the selected sender to the Turf directory, clear the Delete messages instead of moving to the Turf directory check box.
Exchange 5.5 requires the use of a third-party plug-in, to check block list services and filter spam. These block lists will contain the IP addresses of well know spammers and open relays. Some of these lists are free to the public and others will cost money to subscribe. One of the easier freeware tools you can use to connect to the block lists is GFIMailEssential for Exchange/SMTP. Click here for more information on how to use block lists and to download the tool.
It is worth noting that there are a number of very good third-party spam filtering software products on the market that are still compatible with Exchange 5.5. Of course the drawback there is you have to pay for them.
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