First-time postfix server setup

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http://www.linuxquestions.org – Hello all. I'm running Red Hat 64-bit 6.4 in my lab. I have a server called backup that is used for my Postfix mail server as well as dnsmasq for handling name resolution (lighter more simpler BIND). Lastly, I have stood up LDAP without the extra Kerberos/SASL hassle just for testing purposes. Lastly, I've intentionally disconnected outside access to these sets of test machines so they're on their own network. I'm trying to figure out why mail isn't getting received. I've tried sending from the backup server as well as other hosts in the lab I have and am not having much luck. I underst (HowTos)