Email deliverability is the layer under everything in email. Flows, campaigns, subject lines, design: none of it matters if the message lands in spam. And deliverability fails silently. Open rates sag, revenue per send drifts down, and the team responds by testing subject lines while the actual problem is reputation plumbing.
This is infrastructure for the whole retention cluster, especially email automation and the flows.
Plain English versions:
| Record | What it proves | Failure symptom |
|---|---|---|
| SPF | This server is allowed to send for this domain | Soft spam placement, "via" labels |
| DKIM | The message wasn't tampered with and really comes from the domain | Spam placement, broken brand display |
| DMARC | What receivers should do when the first two fail, plus reporting | No policy means no protection and no visibility |
Since February 2024, Gmail and Yahoo enforce requirements on bulk senders: authentication including DMARC, one-click unsubscribe, and a user-reported spam rate held under 0.3%. These stopped being best practice and became entry conditions. Most platforms walk you through the DNS records; the work is an afternoon and the absence is a permanent tax.
Once authentication passes, inbox providers grade you on how people react. The inputs that matter: spam complaints, sustained non-engagement, bounces to dead addresses, and spam-trap hits from old lists. This is why the sunset flow exists. Continuing to mail people who never open is not harmless persistence; it's actively teaching Gmail that your mail is unwanted, and that lesson gets applied to your engaged subscribers too.
The hygiene rules:
Recovery is gradual by design. The sequence: fix authentication first, suppress everyone unengaged, then send only to your most engaged segment (recent openers and recent buyers) for several weeks so providers re-learn that people want your mail, then widen slowly. Sending harder to the full list to "make up the revenue" is the instinct, and it deepens the hole.
Usually reputation, not content: rising complaints, mailing unengaged segments, an authentication record broken by a DNS or domain change, or a list-quality problem. Check Postmaster Tools and your authentication before touching subject lines.
For bulk senders since February 2024: SPF and DKIM with a DMARC policy, one-click unsubscribe, and user-reported spam kept under 0.3%.
Suppress them after a sunset attempt. List size is a vanity number; the engaged share of the list is what protects deliverability and revenue.
Qwrki runs email and retention operations as part of the operating layer, so deliverability is a standing job, not a fire drill. We keep authentication, list hygiene and the monitoring dashboards in one place, and we catch a Gmail-only dip before it costs you revenue. Book a call if your open rates are sliding and you want a clear read on whether it's reputation or content.
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