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A comment on You don’t want to be on Cloudflare’s naughty list. Parent comment

Re:You don’t want to be on Cloudflare’s naughty list by namibj on Sunday September 25, 2022 @10:12AM (#32971512)
That doesn't rule out DKIM, which only requires the `From:` header's domain to list a pubkey and the email to include a DKIM signature from a matching private key. SPF is the one that regulates which hosts a domain's outbound SMTP servers are on.
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