Anti-Spam

Open Relay Database ORDB.org shuts down

After five and a half years, the non-profit organization ORDB is shutting down its DNS service (a Realtime Block List of open relays) and mailing list today, because the general consensus within ORDB is that open relay RBLs are “no longer the most effective way of preventing spam from entering your network”. The ordb.org web […]

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Exchange Server 2007: How are RBLs performing?

Exchange Server 2007 includes a script that reports on how Realtime Block Lists (RBLs) perform – it provides the number of messages blocked. The script – Get-AntispamTopRBLProviders.ps1 can be found in the \Exchange Server\Scripts folder. To run it, fire up Exchange Shell: .\get-antispamtoprblproviders.ps1 Name Value—- —–Spamhaus SBL-XBL 6626SORBS 33NJABL 2 The script can be constrained […]

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IMF: How to customize NDR message

Do you have IMF setup to reject messages at the gateway? If yes, you can customize the NDR message senders get. Exchange MVP and author of Exchange Server 2003 24Seven (renamed in its second edition to Microsoft Exchange Server 2003 Advanced Administration) Jim McBee shows you how in his post titled “Exchange 2003 SP2 IMF […]

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IMF: Where’s the whitelist?

Another frequently asked question – asked frequently enough to make its way here. Does the Intelligent Message Filter (IMF) v1/v2 in Exchange 2003 provide any way of “whitelisting” sending SMTP addresses or domains? (I will continue to use whitelisting as one word. Although it cannot be found in the dictionary, it is a common term […]

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Update: Manually removing IMF v1

Scott Schnoll has an update regarding the recent post Intelligent Message Filter (IMF) v1 download removed from microsoft.com, and the issue of not being able to remove IMF v1 from Add/Remove Programs (if one doesn’t remember which account was used to install it or the account is no longer available) without reinstalling it. Here’s the […]

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Intelligent Message Filter (IMF) v1 download removed from microsoft.com

A newsgroup poster recently informed that Microsoft has removed Intelligent Message Filter (IMF) v1 download from the IMF downloads page. IMF v1 was a separate download. IMF (v2) is a part of Exchange Server 2003 SP2. Excerpt from IMF v1 Release Notes [still available here] regarding uninstalling IMF:To uninstall Intelligent Message Filter, use Add or […]

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Microsoft opens up SenderID

Microsoft announced today it’s putting its SenderID technology under its Open Specification Promise program. This allows anyone to create products or services using SenderID technology. SenderID lets (receiving) mail servers determine whether a sending mail host is authorized to send email for a particular domain, based on SPF records published in the sending domain’s DNS. […]

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Install anti-spam agents on Hub Transport server

If you’re using Exchange Server 2007 in a topology with an Edge Transport server, the anti-spam agents – Connection Filtering, Content Filter Hub Transport node in the EMC. After the antispam agents are installed, you can see the Anti-spam tab in Organization Configuration | Hub Transport node in EMC. If your console was open during […]

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Spamhaus, the E360Insight lawsuit and the future of RBLs

If you’ve been keeping track of spam issues and RBLs, you probably took notice of the recent order by an Illinois court against leading RBL provider Spamhaus for listing Wheeling, IL-based E360Insight on its ROKSO (Register of Known Spam Operations) list. In a no-defence, default ruling, U.S. District Judge Charles Kokoras ordered [PDF] Spamhaus to […]

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IMF: Gateway thresholds per server

So far we’ve known that Exchange Server 2003’s content filter – the Intelligent Message Filter (IMF), uses Gateway and Store thresholds and (Gateway) action that are configured once in Global Settings | Message Delivery | properties | Intelligent Message Filtering. These global settings apply to all SMTP Virtual Servers on all Exchange Servers in the […]

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