It does have one limitation; the sending mail server needs to have a valid R-DNS listing. In this particular case it doesn't so you CANNOT use whitelist_from_recvd here.
Doe sit simply need to be valid, or does it need to by identical?
My mail server does double duty as my secondary MX, so the r-DNS for 64.140.43.68 is ns2.covisp.net instead of mail.covisp.net. Is the fact that the domain and tld are the same good enugh for whitelist_from_rcvd?
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And I just don't care what happens next / looks like freedom but it feels like death / it's something in between, I guess
