>    _450_Client_host_rejected:_cannot_find_your_hostname,_[]

Your mail server is identifying itself as [] instead of a
host with (valid) forward DNS records (hosts that do this are blocked
as a -- very effective -- anti-spam measure).  Fix your mail server to
identify itself as gatehouse.quadtelecom.com and you should get past
this filter.
"hostname" is postfix jargon for HELO hostname, so are you saying he must correct his helo hostname?

Unfortunately, postfix also uses the same phrase "cannot find your hostname" for the reject_unknown_client rejection of the envelope @sender.domain, where ip sending to postfix does not have matching PTR and A records.


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