updated 07:40 pm EST, Mon November 15, 2010
Earlier version had e-mail delivery bug
The 10.6.5 update for Mac OS X Server, removed earlier today, has been restored with a fix for an e-mail delivery bug found in the original version. The new build, 10H575, fixes a memory aliasing issue introduced in the earlier version in Dovecot's handling of user names, resulting is mail potentially being delivered to the wrong user on machines using Dovecot as a mail server. The issue only affects machines running the earlier-posted version of 10.6.5 Server, and also does not affect the original Dovecot open-source project.
The new version is officially known as Mac OS X Server 10.6.5 Update, v1.1, and weighs in at 858.02MB. It is available now to affected users running 10.6.4 to 10.6.5 (10H574) via Software Update or via Apple's software downloads web page.