Inbox-first. Validated before you send.

Built for inbox placement, compliance, and measurable outcomes—not vanity metrics.

Deliverability, Compliance, and Proof—Before You Send.

Preflight gates, inbox placement verification, tenant isolation, and evidence packs—built as an operating system, not an ESP.

Run a Preflight Demo View Proof Pack

eSignalFlow flow: Draft to Preflight to Gates to Placement Lab to Send to Proof Pack

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The OS Loop

Measure, Decide, Act, Prove—control before send. Your core differentiator.

Measure

Placement + ISP signals

Decide

Policy gates + budgets

Act

Throttle, isolate, pause

Prove

Evidence, replay, export

Send first, explain later?

Not here.

Send-and-hope vs. engineered delivery comparison

Check deliverability

No account needed.

Proof Packs

Downloadable evidence for compliance and audits. No send without proof.

Consent proof

Timestamped opt-in and preference records.

View in dashboard →

Unsubscribe proof

One-click and list-suppression evidence.

View in dashboard →

Auth readiness proof

SPF, DKIM, DMARC verification packs.

View in dashboard →

Incident timeline pack

Postmortem and remediation audit trail.

View in dashboard →

Multi-tenant reputation isolation

Tenant A bad event stays in an isolated pool—no spill to Tenant B.

Tenant A

Bad event

Isolated pool

Contained

Tenant B

No spill

Trust Center

SOC2-ready posture, audit exports, data residency. Evidence when you need it.

SOC2-ready

Security and availability controls.

Audit exports

Evidence packs and compliance bundles.

Data residency

Region options for regulated workloads.

Status page →

Fair, predictable pricing

Pricing that scales with you

Start free. Pay for what you use. No surprise bills or per-seat tricks.

How many emails do you send per month?

50k

5k50k100k200k500k

Recommended for you

Signal— $49/mo

Core

Proof

No credit card

Core

Start with room to grow — no card required

25kemails/mo included

Free

Basic deliverability checks
Email builder & analytics
Community support

Signal

Deliverability OS — Preflight, Placement Lab, Trust Capital

Matches your usage

150kemails/mo included

$49/month

$0.06/1k after included

Preflight + Placement Lab
Trust capital tracking
Priority support & API access

Proof

Unlimited scale, SLA, dedicated partnership

∞unlimited

Custom

Constitutional AI & multi-region
Dedicated support & custom integrations
SLA guarantee & advanced security

Every plan includes Constitutional AI, Trust Capital, and Zero-Failure Unsubscribe. No per-seat fees. No lock-in.

High volume or custom needs? We’re happy to design a plan that fits →

Start with Preflight in 24 minutes.

One click into dashboard onboarding.

Get started

Inbox-first. Validated before you send.

Built for inbox placement, compliance, and measurable outcomes—not vanity metrics.

Deliverability, Compliance, and Proof—Before You Send.

Preflight gates, inbox placement verification, tenant isolation, and evidence packs—built as an operating system, not an ESP.

Run a Preflight Demo View Proof Pack

Loading metrics...

The OS Loop

Measure, Decide, Act, Prove—control before send. Your core differentiator.

Measure

Placement + ISP signals

Decide

Policy gates + budgets

Act

Throttle, isolate, pause

Prove

Evidence, replay, export

Send first, explain later?

Not here.

Draft to inbox

The safe path.

eSignalFlow integrates directly into your application or communication workflows to send authenticated, permission-based email at scale. Messages are validated before sending, delivery is monitored in real time, and reputation-protecting controls are enforced automatically—whether sending one message or millions.

Connect

Link your domain with SPF, DKIM, DMARC validation

Build

Email builder with flow-based orchestration and variants

Predict

Trust capital forecasting and deliverability prediction

Deliver

Validated sending with autonomous defense systems

Learn

Continuous optimization with feedback loops and placement data

Built for outcomes

Not just features.

Flow orchestration

Flow-based automation and campaign orchestration

10x faster campaign creation

Flow steps

Learn more

Trust Capital

Real-time trust accounting with predictive forecasting

98.5% deliverability rate

Trust Balance

1,000

Learn more

Deliverability Defense

Autonomous reputation protection and ISP throttling

Zero spam folder placement

Deliverability Rate

98.5

Learn more

Constitutional AI

Immutable governance rules enforced before every send

100% compliance guarantee

Constitutional Checks

Learn more

Zero-Failure Unsubscribe

Multi-region unsubscribe with guaranteed processing

100% unsubscribe success

Unsubscribe Rate

0.01

Learn more

Real-Time Analytics

Live metrics with WebSocket and SSE updates

Instant campaign insights

Active Campaigns

Learn more

Use Cases

eSignalFlow is designed to support a wide range of permission-based email communication use cases, from real-time system notifications to large-scale, compliant bulk campaigns.

Organizations use eSignalFlow to ensure their messages are delivered reliably, responsibly, and in full alignment with recipient expectations.

•Transactional emails (account alerts, confirmations, security notifications)
•Operational and workflow notifications
•Permission-based bulk email campaigns
•Product updates and service announcements
•Educational and informational communications

Compliance & Deliverability by Design

Deliverability and compliance are foundational to eSignalFlow. Every message sent through the platform is governed by built-in safeguards that protect sender reputation and respect recipient consent.

Permission-based sending only
Automated unsubscribe enforcement
Immediate suppression for bounces and complaints
Support for SPF, DKIM, and DMARC authentication
Practices aligned with CAN-SPAM and global email standards

All recipient lists are opt-in, continuously monitored, and automatically cleaned to suppress bounces, complaints, and unsubscribed addresses.

See it live

Real-time dashboard preview.

Live data

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Open full dashboard

Built for you

No matter your role.

Marketing Director

Deliver millions of emails with guaranteed deliverability and compliance

Key Benefits

98.5%+ deliverability rate

Zero-failure unsubscribe

Enterprise security & compliance

Real-time analytics & reporting

Built differently

Not just another email platform.

Constitutional AI

Immutable governance rules enforced before every decision. Not optional, not configurable.

Trust Capital Accounting

Every send affects your trust balance. Predictive forecasting prevents reputation damage.

Zero-Failure Unsubscribe

Multi-region redundancy ensures unsubscribe requests are never lost. Legally defensible.

Agentic Orchestration

Intelligent systems work together. Not separate features, but a unified system.

Autonomous Defense

ISP throttling detected? Automatic remediation. No manual intervention required.

Federated GraphQL

Strongly typed, globally optimized queries. Not REST endpoints, but a unified schema.

Intelligent AI Models

Advanced AI models with cutting-edge capabilities. Always up-to-date with the latest technology.

Multimodal AI

Text, vision, audio. Image-to-email, voice-to-email. Full multimodal capabilities across all models.

Check deliverability

No account needed.

Preflight score (demo)78

Ready

Consent & SuppressionReady

AuthenticationNeeds review

Content RiskReady

Check Your Deliverability

Enter your domain to see what eSignalFlow validates (even if you don't connect yet).

Proof Packs

Downloadable evidence for compliance and audits. No send without proof.

Consent proof

Timestamped opt-in and preference records.

View in dashboard →

Unsubscribe proof

One-click and list-suppression evidence.

View in dashboard →

Auth readiness proof

SPF, DKIM, DMARC verification packs.

View in dashboard →

Incident timeline pack

Postmortem and remediation audit trail.

View in dashboard →

Multi-tenant reputation isolation

Tenant A bad event stays in an isolated pool—no spill to Tenant B.

Tenant A

Bad event

Isolated pool

Contained

Tenant B

No spill

Trust Center

SOC2-ready posture, audit exports, data residency. Evidence when you need it.

SOC2-ready

Security and availability controls.

Audit exports

Evidence packs and compliance bundles.

Data residency

Region options for regulated workloads.

Status page →

Fair, predictable pricing

Pricing that scales with you

Start free. Pay for what you use. No surprise bills or per-seat tricks.

How many emails do you send per month?

50k

5k50k100k200k500k

Recommended for you

Signal— $49/mo

Core

Proof

No credit card

Core

Start with room to grow — no card required

25kemails/mo included

Free

Basic deliverability checks
Email builder & analytics
Community support

Signal

Deliverability OS — Preflight, Placement Lab, Trust Capital

Matches your usage

150kemails/mo included

$49/month

$0.06/1k after included

Preflight + Placement Lab
Trust capital tracking
Priority support & API access

Proof

Unlimited scale, SLA, dedicated partnership

∞unlimited

Custom

Constitutional AI & multi-region
Dedicated support & custom integrations
SLA guarantee & advanced security

Every plan includes Constitutional AI, Trust Capital, and Zero-Failure Unsubscribe. No per-seat fees. No lock-in.

High volume or custom needs? We’re happy to design a plan that fits →

Start with Preflight in 24 minutes.

One click into dashboard onboarding.

Get started

Draft to inbox

The safe path.

Connect

Link your domain with SPF, DKIM, DMARC validation

Build

Email builder with flow-based orchestration and variants

Predict

Trust capital forecasting and deliverability prediction

Deliver

Validated sending with autonomous defense systems

Learn

Continuous optimization with feedback loops and placement data

Built for outcomes

Not just features.

Flow orchestration

Flow-based automation and campaign orchestration

10x faster campaign creation

Flow steps

Learn more

Trust Capital

Real-time trust accounting with predictive forecasting

98.5% deliverability rate

Trust Balance

1,000

Learn more

Deliverability Defense

Autonomous reputation protection and ISP throttling

Zero spam folder placement

Deliverability Rate

98.5

Learn more

Constitutional AI

Immutable governance rules enforced before every send

100% compliance guarantee

Constitutional Checks

Learn more

Zero-Failure Unsubscribe

Multi-region unsubscribe with guaranteed processing

100% unsubscribe success

Unsubscribe Rate

0.01

Learn more

Real-Time Analytics

Live metrics with WebSocket and SSE updates

Instant campaign insights

Active Campaigns

Learn more

Built differently

Not just another email platform.

Constitutional AI

Immutable governance rules enforced before every decision. Not optional, not configurable.

Trust Capital Accounting

Every send affects your trust balance. Predictive forecasting prevents reputation damage.

Zero-Failure Unsubscribe

Multi-region redundancy ensures unsubscribe requests are never lost. Legally defensible.

Agentic Orchestration

Intelligent systems work together. Not separate features, but a unified system.

Autonomous Defense

ISP throttling detected? Automatic remediation. No manual intervention required.

Federated GraphQL

Strongly typed, globally optimized queries. Not REST endpoints, but a unified schema.

Intelligent AI Models

Advanced AI models with cutting-edge capabilities. Always up-to-date with the latest technology.

Multimodal AI

Text, vision, audio. Image-to-email, voice-to-email. Full multimodal capabilities across all models.

Deliverability, Compliance, and Proof—Before You Send.

Measure

Decide

Act

Prove

Consent proof

Unsubscribe proof

Auth readiness proof

Incident timeline pack

SOC2-ready

Audit exports

Data residency

Core

Signal

Proof

Start with Preflight in 24 minutes.

Deliverability, Compliance, and Proof—Before You Send.

Measure

Decide

Act

Prove

Connect

Build

Predict

Deliver

Learn

Flow orchestration

Trust Capital

Deliverability Defense

Constitutional AI

Zero-Failure Unsubscribe

Real-Time Analytics

Marketing Director

Growth Engineer

Compliance Officer

AI Researcher

Marketing Director

Key Benefits

Constitutional AI

Trust Capital Accounting

Zero-Failure Unsubscribe

Agentic Orchestration

Autonomous Defense

Federated GraphQL

Intelligent AI Models

Multimodal AI

Check Your Deliverability

Consent proof

Unsubscribe proof

Auth readiness proof

Incident timeline pack

SOC2-ready

Audit exports

Data residency

Core

Signal

Proof

Start with Preflight in 24 minutes.

Connect

Build

Predict

Deliver

Learn

Flow orchestration

Trust Capital

Deliverability Defense

Constitutional AI

Zero-Failure Unsubscribe

Real-Time Analytics

Marketing Director

Growth Engineer

Compliance Officer

AI Researcher

Marketing Director

Key Benefits

Constitutional AI

Trust Capital Accounting

Zero-Failure Unsubscribe

Agentic Orchestration

Autonomous Defense