It is really questionable what the fix should be here. Note that there is the saslauth group that is shared with the cyrus-imapd package - so there certainly the -g 76 option should be added. But the saslauth user should use a different uid that is not preallocated in the setup yet.

This request was evaluated by Red Hat Product Management for inclusion
in a Red Hat Enterprise Linux maintenance release. Product Management has 
requested further review of this request by Red Hat Engineering, for potential
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this change is "nice to have", but in new Fedora version, it's breaking stuff (cyrus-imapd bug #744682 ), so it's a bad idea to fix it in rhel6

For fixing this, I'd have to update cyrus-imapd, but it'd change
a)cyrus user to saslauth user
OR
b)changed uid of cyrus user

both could break existing installations
this change should be reverted

Allocating saslauth user as static id 76 is no-go  - it should be either dynamically allocated or ask for static id reservation in setup package (if required). Creating group is perfectly ok, as this group id is reserved.

Moving back to Assigned and setting blocker, as this change is breaking cyrus-imapd package.

*** Bug 744682 has been marked as a duplicate of this bug. ***

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2011-1687.html