How To Configure The RelayHost In Postfix

http://www.postfix.org/postconf.5.html
“Specify a domain name, hostname, hostname:port, [hostname]:port, [hostaddress] or [hostaddress]:port. The form [hostname] turns off MX lookups.” For example:
relayhost = $mydomain
relayhost = [smtprelay.wyzaerd.com]:2525
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