Postfix Hide hostnames and subdomains from your relay

So your setting up a mail relay or mail agent and your want to strip off the hostname or subdomain before the message gets to the internet:  for example your relay gets it as root@max.blog.jgriffiths.org but you want it to look like root@jgriffiths.org  well this is really simple with postfix.   Just load up your main.cf and add the following line

masquerade_domains = jgriffiths.org

This will strip off everything after jgriffiths.org.  You can add additional domain by placing spaces between hosts.

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