Anti-Spam

Symantec’s State of Spam report: Spam rates declining

Here’s something that should make messaging folks happier (as happy as you can be at this point given the DST 2007 huddle a lot of us may find ourselves in… :) Symantec’s monthly State of Spam report shows some interesting trends over the past month. In particular: 1. Overall percentage of spam “at the SMTP […]

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HOW TO Update multi-valued attributes in PowerShell

Multivalued attributes are simply attributes that can have more than one value. Examples include members attribute of groups, or proxyAddresses attribute of recipients. In GUI interfaces, it is simple to add/modify multivalued attributes. VBScript has control codes that allow you to control the interaction with multi-valued attributes – 1 = clear all entries, 2 = […]

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Empower Your PowerShell with PowerGadgets

Exchange MVP Andy Webb showed off this great tool called PowerGadgets recently that can help you build cool gadgets – with or without Windows Vista. The gadgets take piped output from PowerShell commandlets and scripts (as well as SQL databases and web services). Why I think this is so cool:– it allows you to visualize […]

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Exchange 2007 Content Filter: How to move messages to Junk Mail folder

You’ve setup Exchange Server 2007, and configured the shiny new Content Filter agent (CFA), which is more than just a rewrite of the equally loved and hated Intelligent Message Filter (IMF) from Exchange Server 2003. How do you configure it? Spam Confidence Level (SCL) Thresholds in Exchange 2007/2010 The CFA has the following three thresholds, […]

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Exchange Server 2007: Making SenderID work with non-Exchange smtp hosts

To make the SenderID filter work with non-Exchange smtp hosts acting as your mail gateways for inbound mail, you need to tell Exchange about them. If Exchange does not know about these, SenderID will not be able to determine the correct sending host, and you may see SenderID checks fail on all inbound mail. This […]

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Exchange 2007 Content FIlter: The Whitelist Is Here!

Messaging Hygiene features in Exchange Server 2003, including the Intelligent Message Filter (IMF), did not have a way to whitelist sending domains or SMTP addresses. This is a follow up to a previous post, and one of the more popular ones on this blog— “IMF: Where’s the whitelist?“. (“IMF and whitelist” has for long been […]

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IMF: Updates not showing up in Add/Remove Programs?

Some users report that recent updates to Microsoft’s Intelligent Message Filter (for Exchange Server 2003) do not show up in Add/Remove Programs in Windows. Double-checking on some servers, I’ve noticed this – the last update that shows up on those in Add/Remove Programs is dated 8/10/2006.If you look at the registry key for this update […]

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IMF: Updates live again

This just came in from Scott Roberts – IMF updates are live again. The latest update is dated Jan 11, 2007, version 6.5.7891.0. Given the questions in different forums since the updates were paused/stopped, and particularly between yesterday (when the updates were supposed to kick in) and today – are some users really hooked to […]

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IMF: Updates stopped in December, to resume on Jan. 17th

A lot of users wondered why there were no updates to Microsoft’s Intelligent Messages Filter (IMF) in recent weeks. Many Exchange administrators wondered if it was a problem with their servers when they saw IMF hadn’t been updating automatically – some even posted on different Exchange forums wanting to compare the versions on their servers. […]

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Enabled by default: SMTP Tarpit in Exchange Server 2007

From a recent discussion, and something I’ve been wanting to post about for a while: SMTP tarpitting is enabled by default on Receive Connectors in Exchange 2007 (and Exchange 210). What is SMTP tarpitting? It’s the process of introducing a delay in SMTP connections from hosts that are suspected of inappropriate SMTP behavior – for […]

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