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Email security
SPF says which servers may send mail. DKIM signs messages. DMARC tells receivers what to do with mail that fails.
Frequently asked questions
- What do SPF, DKIM and DMARC do?
- SPF lists allowed senders. DKIM is a cryptographic signature. DMARC uses p=none, quarantine or reject.
- Why is DKIM often missing here?
- The selector is not a standard name. We try google, default, selector1, k1 and a few others.