Apple's Mail Services Update 1.0 for Snow Leopard Server comes with brief release notes, stating only that it addresses "issues affecting overall mail service reliability and performance." Although Apple recommends the update for all users running Mac OS X Server 10.6.2, there have been reports of it causing problems, along with a possible solution outlined in an Apple Discussions thread. It's available via Software Update or the Apple Support Downloads page. Installation instructions for the update are available on Apple's Web site. (Free, 20.59 MB)
Wake On Demand in Snow Leopard
Putting your Mac to sleep saves power, but it also disrupts using your Mac as a file server, among other purposes. Wake on Demand in Snow Leopard works in conjunction with an Apple base station to continue announcing Bonjour services that the sleeping computer offers.
While the requirements for this feature are complex, eligible users can toggle this feature in the Energy Saver preference pane. It's labeled Wake on Network Access for computers that can be roused either via Wi-Fi or Ethernet; Wake on Ethernet Network Access or Wake on AirPort Network Access for wired- or wireless-only machines, respectively. Uncheck the box to disable this feature.
Mail Services Update 1.0
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The following thread identifies others experiencing the same problem, with the same series of error message, and identifies a fix that should be better than reinstalling the 10.6.2 installer: http://discussions.apple.com/thread.jspa?threadID=2269047