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> Even SPF isn't enough anymore.

SPF is a old and horribly broken standard, and should not be relied on for at least 10 years now. DKIM and DMARC is the way to go for outbound SMTP.

Google didn't break SMTP, spammers did.



Heh, so many anti-https people here that seem clueless the internet is not a safe place. There is always someone out there looking to exploit you on the net.




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