Block Spam Exchange

Block Spam Exchange

Block Spam Exchange Microsoft Exchange Server 2003 now has built-in Open Relay Filter (ORFilter) or DNS Blacklist and Realtime Blackhole List (DNSBL, RBL) capabilities, which releases us from the need to rely on 3rd party software for the spam filtering. Intelligent Message Filter is based on Microsoft SmartScreen Technology from Microsoft Research. By using e-mail characteristics tracked by SmartScreen technology, Intelligent Message Filter can help determine whether each incoming e-mail message is likely to be spam. Based on this likelihood, you can choose to block e-mail messages at the gateway or at the mailbox store. The anti-spam features in Exchange 2003 are far from complete, and using software like Policy Patrol and others is still recommended, but for small businesses or companies that cannot afford these products - Exchange Server 2003 can now handle most the job, especially with IMF around.

However, there are still many problematic "features" (as Microsoft likes to call them) in the built-in anti-spam support in Exchange 2003. One bad thing about the Exchange Server 2003 Spam protection options is the fact that there is no GUI-easy way to import or export blocked e-mail addresses or sending domains.

Another bad thing is that there is no default way to see if the filters are working, and how much spam is blocked.


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To download exchange 5.5 spam filter (Zip, Disclaimers, Spam Filter and Enterprise), please fill out your details below and click Submit. The fields marked with * are required. The evaluation version is fully functional for unlimited users for a period of 30 days after installation.

The spam blocking software download includes spam blocking software Zip, Exchange Spam blocker, Policy Patrol Spam Filter and block email exchange. After installation, you can select which version to evaluate when connecting to the server for the first time in the Policy Patrol Administration console.

Policy Patrol can be installed with Exchange Server 2003, 2000 & 5.5 and Lotus Notes/Domino or any other SMTP mail server. See the Quick Start guide for more instructions.
 

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Stop Exchange Spam blocker

Before we begin this week's tip, I recently mentioned the new holiday file Microsoft released, which included holidays for 2003-2007. It's been reported that there are at least two errors in the file, one for Hanukah and Independence Day. How many can you find? Write to me at outlook@cdolive.com, if you are using the new holiday file and find these or additional errors.

This week's tip is for Exchange Server administrators. If you aren't an admin but still get too much spam on your Exchange account, you might want to forward this tip to your administrator.

Exchange Server includes just one spam fighting feature: Filter. It's not as good as a content filter, since it only filters on the sender's addresses and only stops spam from known spammer domains, but for those companies without a content filter, it can reduce the amount of spam the users receive and costs nothing to implement.

In Exchange 2000, Filter is located in Global properties, right click on Message Delivery. In Exchange 5.5, it's at Connections | Internet Mail Service properties | Connections tab. Both versions allow you to archive messages, but archiving requires a lot of disk space if you get a lot of spam.

Both servers have the option to filter blank senders, this is not recommended, since read receipts often have blank sender fields. You can filter without notifying the sender that you are filtering, which is recommended to reduce server load. Some of the spammer domains use NDRs (Non-Delivery Receipts) to remove names from their mailing lists, others may decide NDRs indicate filtering on their domain name so they switch to a new domain. In one test I did, approximately one-third of all NDRs were returned as undeliverable, which generated more traffic on my server.

exchange 2000 spam blocker works by comparing the senders email address to your list of domains you don't want mail from.. The filter accepts several different formats, including the full email address, cpo@edirect.com or @mailbox.com. It accepts wild cards, so you can filter on partial addresses, like deal@* and @*superdeal*. Exchange seems to have a limit of about 1500 items in the list, so the ability to use wild cards is important and done properly, can greatly reduce the amount of spam you get, without blocking mail you want.

 

 

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