Practical fixes for the SPF, DKIM and DMARC problems that actually break mail.
SPF fails silently once it needs more than 10 DNS lookups. Here is how to count your lookups, which mechanisms cost one, and four ways to get back under the limit.
What each DMARC policy actually does to your mail, how long to stay at p=none, and a safe rollout schedule to p=reject without losing legitimate email.
DKIM keys hide behind a selector name you have to know. Here is how selectors work, the common selectors per provider, and how to find yours from a real email.
SPF, DKIM, DMARC, one-click unsubscribe and a spam rate under 0.3%. What each requirement means in practice and how to verify you meet them.
Work the causes in the order that actually finds the problem: authentication first, then reputation, then content. With the checks for each.
Publish a working DMARC record today: the exact DNS entry, what every tag does, and how to read the reports that come back.
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