SMTP

Troubleshooting IMF: Important performance counter

Earlier today I saw some strange behavior with Intelligent Message Filter (IMF) v2. Incoming internet mail wasn’t getting scanned by IMF. Outlook did not show the SCL values for any message! That in itself wasn’t the strange part. I’m positive I have the right gateway and store thresholds, and I have IMF enabled on the […]

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Creating an additional SMTP Virtual Server in a EVS

Creating an additional SMTP Virtual Server in a non-clustered environment is pretty straightforward. The same task is a little more complicated in a clustered environment. Before you begin:Need to consider whether you want the new SMTP VS to listen on the same IP address but on a different port or listen on the default SMTP […]

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Exchange Server 2003 SP2, using SenderID? You need this hotfix!

If you’ve just upgraded to Exchange Server 2003 Service Pack 2 and have enabled Sender ID filtering, you need to apply a hotfix to prevent the server from stopping to respond. According to the KBA, the problem occurs because of a race condition caused by the SMTP protocol. A race condition occurs when a device […]

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Exporting Sender Filter List

Messages from specific senders can be blocked by implementing sender filtering. Blocked senders are specified in Global Settings Message Delivery properties Sender Filtering tab (see screenshot). The Senders list is saved in the msExchTurfListNames attribute of the Default Message Filter object. It is a multi-valued attribute. It can be exported using ldifde/csvde if you take […]

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Exchange Server 2003 SP2 and IMF

Before you install Exchange Server 2003 SP2 you need to uninstall Intelligent Message Filter (IMF). When you do this, the settings from the SMTP virtual server where you allowed filtering are also removed. After SP installation if you go to Intelligent Message Filtering settings (Global Settings -> Message Delivery -> Properties -> Intelligent Message Filtering […]

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Sending mail from telnet session

This procedure is commonly used to troubleshoot SMTP hosts. In combination with a nslookup query for MX records for a domain (listed after this) you can successfully figure out if a given domain can receive internet email successfully. 1) Open a telnet session to a SMTP – let’s say foo.mydomain.com – or an IP addresstelnet […]

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HOW TO: Export all email addresses from a domain

Background: The Active Directory Users & Computers (ADUC) UI lets you list the mail column for each object, which displays the default (SMTP) email address for objects. You can export the list from ADUC to a CSV/txt file. However, any additional email addresses in the proxyAddresses attribute are not exported. There’s no GUI interface (in […]

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How to create a Recipient Policy based on Company names?

One of the more frequently asked questions in an environment where you want to host more than 1 company’s email on a single Exchange server. Both companies have unique dns domains, let’s say CompanyA.com and CompanyB.com. You typically end up locating thw users from the 2 (or more) companies in their own respective OUs. You […]

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Frequent reports of NDRs with 5.7.1 errors

Noticed an increase in NDRs with 5.7.1 error from posts in newsgroups and a colleague saw 2 of those within the last week. If you’re using Exchange, you may see Event IDs 1709 and 1710 in your Application Log. Some common causes:1) Allow computers which successfully authenticate to relay checkbox not checked on SMTP virtual […]

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Exchange SP2 – Connection Filtering that actually works

I was excited to find out about Connection Filtering (screenshot) in Exchange 2003 – finally I could use RBLs (real-time block lists) without having to dabble with event sinks!! (This is from back in the days when RBLs were still sexy and could keep a good chunk of spam away from your users… ) Connection […]

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