Can Symantec Mail Security for Microsoft Exchange block messages based on their size?
Symantec Mail Security for Microsoft Exchange (SMSMSE) can block emails based on attachment size, but not total size of the message. If you would like to block based on attachment size, please refer to the SMSMSE implementation guide (located in the DOCS\SIFMSMSE folder on the installation media) Chapter 8: "Filtering Content".
If you would like to configure limits based on total message size, please follow one of the Microsoft documents below for a native Exchange solution:
Note: These are external links, Symantec makes no guarantees of the suitability of the information contained therein for your specific implementation. Exchange 2000 and 2003 - How to set size limits for messages in Exchange Server http://support.microsoft.com/kb/322679