Centos-6.4 + Nagios + Postfix - Email notifications

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http://www.linuxquestions.org – Setting up a Nagios box at home, but I`m having trouble getting email notifications to send. Nagios appears to be working fine. It is monitoring devices but alerts are not being sent. I get the following error in the maillog: = Jul 21 11:48:53 nms postfix/pickup[2271]: 3494B7A6D: uid=0 from=<root> Jul 21 11:48:53 nms postfix/cleanup[2546]: 3494B7A6D: message-id=<[email protected]> Jul 21 11:48:53 nms postfix/qmgr[2272]: 3494B7A6D: from=<[email protected]>, size=434, nrcpt=1 (queue active) Jul 21 11:48:53 nms postfix/smtp[2548]: 3494B7A6D: to=< (HowTos)