Did you know that there are four separate places where you can set message size limits in Exchange? If any one of them has a lower size limit than another, then that restriction applies. So you can set size limits at the following levels:
- At the connector. You can configure different message sizes for each connector.
- at the SMTP Virtual server
- and at the individal user level
There’s a good example in the KB article which explains how it works and helps to troubleshoot issues and stops you going round and round in circles. But be aware of the conditions that can prevent message delivery:
In this example, the following size limits have been configured:
||The global setting is set to 5 MB.
||The Exchange SMTP connector is set to 3 MB.
||The SMTP virtual server is set to 4 MB.
||The user mailbox setting is set to 2 MB.
Because of these settings, users in the Exchange 2000 or Exchange 2003 organization can send and receive messages that are a maximum of 5 MB. Users can send messages through the connector that are a maximum of 3 MB. All mail that passes through the SMTP Virtual Server (sending or receiving) is limited to 4MB. The individual user, whose mailbox setting is 2 MB, is also limited to sending and receiving messages that are a maximum of 2 MB.
Oooh! this is interesting. Whenever we talk about the Exchange Best Practices analyser, we get asked where it fits in with MOM and MOM’s management pack and guide for Exchange. Well here’s the thing that effectively connects MOM and the ExBPA. You can even now deploy ExBPA using MOM. Download it here
The ExBPA Management Pack works in conjunction with the ExBPA tool to provide administrators with recommendations on how to improve performance, scalability and availability of Exchange server topologies.
The Microsoft Exchange Server Best Practices Analyzer (ExBPA) Management Pack can be used to deploy the ExBPA tool on computers running Microsoft Exchange Server 5.5, Exchange 2000 Server and Exchange Server 2003. Using a timed event, the tool will run automatically on each server and write any identified performance, scalability and availability issues to the Windows NT Event Log. The ExBPA Management Pack will interpret these events and generate the appropriate alerts on the MOM Management Console.
The ExBPA Management Pack works in tandem with the ExBPA tool:
o Identification of Exchange server configuration issues which could result in poor performance, scalability and unplanned downtime
o Automated analysis and root cause identification
o Support for third-party software and hardware
o Self-updating database and help content
o Links to over 500 articles on the Web
o Works with Exchange Server 2003, Exchange 2000 Server and Exchange Server 5.5 (in mixed mode topologies)