The new version of vixie-cron released for RedHat 5.2 to fix a security problem (vixie-cron-3.0.1-36.5.2) uses a feature of logrotate (the 'missingok' keyword) that is not available in the version of the logrotate package released for RedHat 5.2; 'missingok' is only supported in the logrotate on 6.0+. The result is an email a night from every system with the vixie cron update applied. In some environments, this is a lot of mail. (It may also result in the cron log not being rolled; I expect to find out soon.)
On checking, I've discovered that this is already a known and fixed bug in the cron package. My apologies for not checking thoroughly enough *before* I filed this report; it can be discarded as fixed already (or a duplicate).