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How to set size limits for messages in Exchange Server
Article ID: 322679 - View products that this article applies to.
This article was previously published under Q322679
This article describes the different kinds of limits that you can set on message size in Microsoft Exchange 2000 Server and in Microsoft Exchange Server 2003. It also explains how you can set these limits.
Note If you have configured a size limit on either the Send or Receive sizes in global settings, the More Restrictive limit applies to both incoming and outgoing e-mail messages.
Size limits for messages depend on various settings. Settings can vary across users. You can customize the settings for the Exchange 2000 or Exchange 2003 organization, a specific connector, a specific virtual server, and an individual user.
Senders may receive a non-delivery report (NDR) that is similar to the following example if their messages are larger than their size limits:
Your message did not reach some or all of the intended recipients.
Sent: 7/18/2002 2:40 PM
The following recipient(s) could not be reached:
Test Recipient on 7/18/2002 2:41 PM
This message is larger than the current system limit or the recipient's mailbox is full. Create a shorter message body or remove attachments and try sending it again.
Global settingThis setting determines the maximum size of the messages in the Exchange 2000 organization; the messages can be incoming, outgoing, or internal.
To configure the global setting, follow these steps:
Connector settingThe settings for each connector control the maximum size of outgoing messages that users can send through the connector.
To configure the connector settings, follow these steps:
SMTP virtual server settingThis setting determines the maximum size of a message that is permitted to pass through a virtual server. The virtual server advertises the limit by means of the Extended Simple Mail Transfer Protocol (ESMTP) SIZE command verb (RFC 1870).
Note The protocol size restriction is meant to reject messages on boundaries with other e-mail systems. These restrictions are effective for individual servers and should not be used as methods to limit the message size in an Exchange enterprise server group. Administrators can set the message delivery option in the global settings to limit and to control the message size restriction across an organization that uses Exchange 2000 or Exchange 2003. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/326154/ )The OAB does not replicate if you set a message size restriction at the transport level
To configure the Simple Mail Transfer Protocol (SMTP) virtual server setting, follow these steps:
User mailbox settingThis setting determines the maximum size of a message that users can send or receive through their mailboxes. User mailbox settings are enforced by the information store instead of by the message categorizer. The information store prevents an oversized message from being sent to Transport if the message size exceeds the user mailbox maximum message size setting.
To configure an individual user's mailbox settings, follow these steps:
Examples of effective size limits
Example 1In this example, the following size limits have been configured:
Example 2In this example, the following size limits have been configured:
Note All Internet e-mail messages use the global setting for limits on sending and on receiving. The message categorizer evaluates the sender's sending limit and the recipient's receiving limit. In example 2 earlier, a user with a user mailbox limit of 3 MB could receive messages from another user with a 3-MB sending limit. Because Internet users use the global setting, they can send only a 2-MB message.