Headless API · email playbookTurn Clay or Apollo lists into personalized, on-brand sequences
A turn clay or apollo lists into personalized, on-brand sequences playbook for Sales & Outbound, built headless api. Starting from a target list is enriched in clay or apollo, Mailable designs every on-brand email in the flow and ships it through crm (salesforce / hubspot) and the tools you already use - inbox-ready in every client.
Headless APIBuild mode: Built via the headless API + MCPTrigger
A target list is enriched in Clay or Apollo
Sales & Outbound
Design engine
Mailable
prompt → on-brand email
Brand kit
colors · fonts · voice
Who runs it
Build mode
Built via the headless API + MCP
SDRs & AEs
team
RevOps
team
Founders
team
Integrations
Synced via API & MCP
Sends to
CRM (Salesforce / HubSpot)
Clay / Apollo
Sequencer
How the flow works
Trigger: A target list is enriched in Clay or Apollo
- 1
Mailable turns the list into a personalized, on-brand opening email
- 2
Merge fields pull in company and persona context - it reads human
- 3
A multi-step cadence with follow-ups is designed in the same pass
- 4
Sent from your CRM or sequencer via the API, on-brand across reps
Who runs it
- SDRs & AEs
- RevOps
- Founders
Integrations
Synced from your stack; designs stay on-brand by default.
Build mode & destinations
Built via the headless API + MCP
CRM (Salesforce / HubSpot)
Clay / Apollo
Sequencer
What keeps it on-brand & on-track
- Personalized at scale without copy-paste or brittle mail-merge
- Every rep stays on the same brand and voice
- Designed and sent programmatically via the headless API
Headless API
Your product or an LLM agent calls the Mailable API (or MCP server) to design and send this flow programmatically - on-brand, inbox-ready HTML, no browser required.
More Sales & Outbound playbooks
Describe it. Ship beautiful email.
Start free, or talk to us about designing email at scale through the editor and the headless API.