Run your email from any AI agent,
over MCP.
A Customer.io alternative your AI agent can run. Send campaigns, manage contacts and read analytics over MCP or REST, through Resend, SendGrid, Postmark, SES, or Mailgun. Every AI action produces a certificate-grade audit trail: premises, execution trace, conclusion.
No credit card required on the free plan.
What you get
Everything your AI agent needs to run email.
Nothing it doesn't.
AI-Powered Everything
Brand voice enforcement, campaign advisor, content suggestions, and per-subscriber personalization. Claude writes your emails with certificate-grade reasoning — you approve and send.
Visual Workflow Builder
Drag-and-drop campaign flows with branching logic, conditional paths, and A/B testing. Design complex sequences visually, not in spreadsheets.
Smart Campaigns
Sequences, broadcasts, triggered automations, recurring newsletters, and timezone-aware scheduling. Multi-step with per-step analytics.
Contact Intelligence
Engagement scoring (0-100), lifecycle stages, custom properties, duplicate detection with fuzzy matching, and automatic email verification.
Revenue Attribution
Track conversions from email campaigns, measure per-campaign ROI, and surface revenue insights in your dashboard.
Conditional Content
Show different content to different subscribers based on engagement level, tags, lifecycle stage, or any custom property. One campaign, many experiences.
Embeddable Forms
Build signup forms, embed on your website, auto-tag and segment new subscribers. Double opt-in built in. Topic-based preference center included.
Full API + MCP
REST API for transactional sends, events, and conversions. Full MCP integration — every operation in Sendinel is accessible to AI agents with auditable tool traces.
Deliverability Suite
Domain health monitoring, warmup enforcement, DMARC reports, proactive Slack alerts, automated recovery plans, and provider portability when one pipe fails.
No-lock-in Migration
Import from Customer.io, Mailchimp, Klaviyo, ActiveCampaign, Kit, Resend, CSV, sent-items archives, or concierge screen-walk. Suppressions and audit evidence come with you.
How it works
From zero to sending in minutes.
Connect your stack
Run the setup wizard. Point Sendinel at your data layer, email API, and sending domain. DNS is auto-configured in one click - no manual record editing.
Build your audience
Import subscribers via CSV or API. Sendinel scores engagement, tracks lifecycle stages, and segments by behavior automatically.
Describe. Approve. Send.
Tell the AI what you want to send and who to send it to. Review the draft. Activate. The rest is automated.
Pricing
Flat rate. No surprises.
No per-subscriber fees. No usage creep. Cancel any time.
* BYOD unlimited subscribers and sends are bounded by your own database and email provider account limits.
Start free.
Upgrade when you're ready.
No card required on the free plan. Takes about 5 minutes from signup to your first send.
Get started freeFree plan · No credit card · Cancel any time