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by viraptor 1372 days ago
Not necessary. Just very highly recommended. I can still deliver my cron emails from a rando host successfully.
1 comments
namibj 1369 days ago
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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