Cold email deliverability: a practical checklist
The settings and habits that keep your emails landing in the inbox — SPF, DKIM, DMARC, warm-up, and the human factors that matter most.
Deliverability is mostly a reputation problem, not a technical one. Authentication gets you to the table; relevance and engagement keep you there. Here is the checklist that matters.
Authentication (do this once)
- SPF: authorize the servers allowed to send for your domain.
- DKIM: cryptographically sign your mail so receivers can verify it.
- DMARC: tell receivers what to do with mail that fails the above.
Reputation (the part everyone skips)
Mailbox providers watch how people react to your email. Replies and opens build reputation; spam complaints and deletes destroy it. No amount of warm-up offsets sending email people did not want.
The human factors that beat any setting
- Send fewer, more relevant emails to people who will actually want to hear from you.
- Send from your real, established inbox rather than throwaway domains.
- Make it easy to reply — engagement is the strongest positive signal.
This is why Ember sends from your real inbox, in low volume, to people you have a genuine reason to contact — the opposite of the volume game, and far better for deliverability.
Frequently asked
- What hurts deliverability the most?
- Sending high volumes of unwanted email is the single biggest factor. Authentication (SPF/DKIM/DMARC) matters, but engagement and relevance matter more — recipients marking mail as spam is what truly damages a sender.
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