Michael Deutschmann wrote:
That said, I believe making reject-on-SPF-fail a MUST is a bad idea, [...]
And recipients who have whitelisted all forwarders are very interested to
make that distinction.
How can a recipient whitelist all forwarders? That seems a daunting task,
and requiring it may hinder setting up new mail servers.
Having shared lists of "reputable" forwarders available on the web has the
same limitations of DNSBLs, that SPF was supposed to overcome.
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