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Are you thinking of DKIM? SPF only requires configuring a DNS entry. Also DKIM did not start with Google. DKIM was originally the work of Yahoo and Cisco. Yahoo

by tssva 8y ago

Are you thinking of DKIM? SPF only requires configuring a DNS entry. Also DKIM did not start with Google. DKIM was originally the work of Yahoo and Cisco. Yahoo, now OATH, has a patent covering it.