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How to Check SPF, DKIM and DMARC Records and Fix Common Email Authentication Errors

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A common deliverability problem occurs when a business's invoices suddenly stop reaching recipients because the domain cannot prove its emails are legitimate. The author, who built the free PixelValut DNS and email tools, explains that SPF, DKIM and DMARC are TXT records that together verify a message really came from the sender's domain. The guide recommends first listing every service that sends mail on the domain, such as mailbox providers, transactional senders and marketing tools. It then walks readers through locating the SPF record in DNS lookups and checking for duplicates, excessive DNS lookups, and risky settings like +all. Readers are also shown how to find the DKIM selector in message headers so the public key can be verified.

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