Plans and Tiers
Service tiers tailored to your evidentiary requirements.
From idempotent API ingestion for transactional volume to Merkle sealing with NOM-151 certificates and dedicated infrastructure.
Transactional
Custom quote
Based on estimated monthly volume
Platforms, fintechs and high-volume systems
For operations requiring reliable delivery, idempotent ingestion and preservation of literal SMTP responses.
- REST API ingestion with Idempotency-Key
- Literal SMTP response transcript from delivery
- Raw DSN reception and archiving (RFC 3464)
- Bounce correlation using VERP
- WORM Object Storage preservation
- Warm-up strategy with deterministic split
- Data residency in OCI mx-monterrey-1
Certified
RecommendedCustom quote
Based on volume and legal requirements
Legal, compliance, HR and collections teams
For legally binding communications requiring proof of existence and content before third parties.
- Everything in the Transactional plan
- Merkle tree (RFC 6962) in 1h / 10k leaf windows
- Root sealing with NOM-151 certificate issued by PSC
- Individual downloadable proof bundle with inclusion proof
- mailack-verify CLI tool for offline verification
- Individual message certificate on demand for litigation
- Priority support during integration and testing
Enterprise
Custom quote
Designed for dedicated requirements
Large senders, financial institutions and strict compliance
Dedicated infrastructure, custom MCP server and a deterministic governor tailored to your corporate policies.
- Everything in the Certified plan
- Dedicated egress IP in OCI mx-monterrey-1
- Dedicated MCP server (mailack-mcp) for AI agents
- Deterministic governor with custom IP/ISP rules
- Custom WORM retention and bucket lock policies
- Direct guidance during the warm-up period (6–8 weeks)
- Service Level Agreement (SLA) and direct channel
Capabilities by service tier
Compare technical and evidentiary features included in each tier.
| Capability / Feature | Transactional | Certified | Enterprise |
|---|---|---|---|
| REST API ingestion & idempotency | ✓ | ✓ | ✓ |
| Literal SMTP response transcript from delivery | ✓ | ✓ | ✓ |
| Raw DSN (RFC 3464) archiving & VERP | ✓ | ✓ | ✓ |
| Data residency in OCI mx-monterrey-1 | ✓ | ✓ | ✓ |
| Merkle sealing & NOM-151 certificate (PSC Codex) | — | ✓ | ✓ |
| Downloadable proof bundle & offline CLI | — | ✓ | ✓ |
| Individual on-demand certificate for litigation | — | ✓ | ✓ |
| Dedicated egress IP (KumoMTA) | — | Optional | ✓ |
| Dedicated MCP server for AI agents | — | — | ✓ |
| Assisted onboarding & warm-up guidance | ✓ | ✓ | ✓ |
No self-service: onboarding is assisted.
To protect IP reputation and ensure SPF, DKIM, DMARC configuration and progressive warm-up are executed properly, there is no instant self-service sign-up. Every client goes through an onboarding process guided by our engineering team.