POSTFIX "Host not found"

Hi. Testing out postfix on RH 7.3 and can't get it to send mail.
For any address, postfix accepts the mail from the client, but it
is never delivered. /etc/postfix/maillog reports "Host not
found" for each one, even though on the command line I can do
lookups to these mx records and connect on port 25 to them. Can
anyone help? Thanks!

Scott

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