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An SPF record tells the world which servers are allowed to send email from your domain. Learn how SPF works, how to write it correctly, and the hidden mistakes that break it silently.
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DMARC tells receiving mail servers what to do when an email fails authentication. Learn how it works, what the three policy levels mean, and how to protect your domain step by step.
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Learn what a DKIM signature is, where it appears in your email, and how it works to protect your domain from spoofing and keep your emails out of spam.
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