Deliverability
Email Deliverability Guide 2026
What the newsroom tells operators before an agent gets a send tool: SPF, DKIM, DMARC, and Gmail rules.
Deliverability ignores your roadmap. Authentication mistakes or a runaway automation move mail to spam faster than any subject-line tweak fixes it.
This guide is the desk's 2026 checklist, with extra rails when an agent can enqueue a send.
Authenticate every sending domain
Publish SPF, DKIM, and DMARC for every domain that sends bulk mail. Gmail and Yahoo enforce one-click unsubscribe and spam-rate thresholds for bulk senders. dmarc.org is the standard, not a vendor blog.
Use a dedicated subdomain for marketing so promotional reputation does not drag transactional mail on the root domain.
- Verify domains inside the ESP before high-volume sends. Brew needs a domain you own for live Emails and automations.
- Monitor DMARC reports weekly during migrations.
- Align From domains with authenticated domains.
List hygiene and consent
Send to people who opted in and still engage. Sunset chronically inactive profiles. Suppress hard bounces and complaints immediately.
Agents should not scrape or infer recipients. Feed them audiences exported from the ESP with documented consent. Brew is permission-based sending only. No cold email.
Guardrails when an agent can send
Add hard limits: per-recipient frequency caps, daily ceilings, mandatory human approval for production audiences, seed-list tests before rollout.
Brew is explicit: agents do not get a separate inbox. Same CAN-SPAM rules, same Gmail thresholds. Gradual send exists for warmup. Pause it. Do not burst a new domain.
What the newsroom would check on Tuesday
Brew is email marketing for teams and agents. You describe a campaign or automation in plain English. Brew designs it on a realtime canvas, keeps it on brand, sends from your domain or exports, and reports analytics the same way.
The default Brew sender is for tests. Live sends need a verified domain. That is the sentence operators skip.
FAQ
- Do AI-generated emails hurt deliverability?
- Mailbox providers judge authentication, engagement, and complaints more than whether copy was model-assisted. Relevance and permission still dominate.