Crontab no longer sending email - Since 10.7-10.9 Upgrade

I just upgraded my server, from 10.7-10.9, to accommodate users on Windows machines and the SMB protocol. There have been a few things I've had to tweak, or re-enable, since doing so. I have a number of cron jobs that run, and email the results to me. I'm no longer receiving any of the emails, which is a huge detriment. I have a number of bash and python scripts, some send daily results of the security log files, which are extremely important! The mail service is running (made no changes to it since upgrade) and I've received a few notifications from the "admin," certificate expiring, etc., but nothing from cron or root. Any ideas? Any assistance is greatly appreciated.