Apple has posted an Mail Services Update for systems running Mac OS X 10.6.2 Server.
According to Apple's notes: "This update addresses issues affecting overall mail service reliability and performance."
"The update is recommended for all servers running Snow Leopard Server version 10.6.2."
The 20.6MB download is available here, along with Apple's built-in Software Update mechanism.
Apple notes a third option, the software update can be installed on a remote server via Server Admin or the softwareupdate command-line utility.
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