Use this two-phase email deliverability checklist before and after high-volume sends: authentication, reputation, list quality, monitoring, and next steps.
The email return path is the bounce address used for delivery failures, not the visible From. Learn how it affects SPF and DMARC alignment and how to monitor it.
Understand SPF alignment, strict vs. relaxed modes, and why it fails within DMARC. A practitioner's guide to keeping your sends aligned and inboxing.
DKIM alignment decides whether a valid DKIM signature passes DMARC. Learn strict vs relaxed alignment, how to fix failures, and monitor it across ESPs.
SPF "too many DNS lookups" (PermError) fails DMARC and hurts inbox placement. Learn why the 10-lookup limit trips and how to fix it without risky flattening.
Set up DKIM correctly across any DNS or email provider, then verify signing, alignment, and selector health so every send authenticates the way you expect.
Learn how DKIM CNAME records work, when to choose CNAME over TXT, how to configure and troubleshoot them, and how to keep DKIM healthy over time.
DMARC policy not enabled" means your domain isn't protected or enforced. Learn what triggers it, how to fix it, and when to move beyond p=none.
Can you have multiple SPF records? No, and here's why it triggers PermError, how to merge them into one, and how to catch it before campaigns break.
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