Jonathan Gardner wrote:
If we decide that Sender ID will only authenticate whether a particular MTA
at an IP address is allowed to send messages for a domain, then Sender ID
is sufficient.
Sufficient, but not necessary; in other words, overkill.
Paging Hector Santos: I couldn't get email directly to you; 550 Return Path
not verifiable after RCPT TO: (and postmaster@ didn't work :-) )
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