Postfix 2.0 is the MTA. How can I allow a host of "63.111.163.37: 450 Client host rejected: cannot find your hostname" to be allowed to transfer mail IN to my server but still use the reject_unknown_hostname recipient restriction?
Looks like you should create an alternate smtpd_restrictions_class and add your client to that class:
http://archives.neohapsis.com/archives/postfix/2001-06/0424.html
Your other option would be to fix the client: either configure its name in DNS, or configure the mailer on that client to use an address that resolves (MASQUERADE under senmdail, mydomain under postfix, etc).
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