Mail Delivery Reports showing no logs

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http://forums.cpanel.net – Hello, I have 2 cpanels servers and 1 dns-only, all of them working very well. I have one of them that's having problems with the "Mail Delivery Reports", no matter what I use to filter, I'm getting 0 results. If I login with a shell, I can grep without any problems the logs located in /var/log, but this tool is very handy for those people that don't have any linux experience. Where should I look? Thanks (HowTos)