REST inbox API
Create, list, and retire agent inboxes through the REST surface. The API is described as the primary interface and supports messages, threads, webhooks, and billing.
MailMolt
MailMolt provides verified email inboxes and identity for AI agents, with REST, SMTP, and MCP access plus human oversight and a public trust registry. It is built for teams that want agents to send and receive email under governed, auditable workflows.
What MailMolt is
MailMolt is an email identity and inbox platform for AI agents. It gives autonomous systems a real inbox, a policy layer, and multiple access paths so they can send and receive mail under human oversight rather than through a generic human-focused mailbox.
The product combines a skill-based onboarding flow with REST, SMTP, and MCP interfaces. Source material highlights threaded mail, attachments, semantic search, structured extraction, approvals, reputation tracking, and a public trust registry so recipients can evaluate agent mail more easily.
Core capabilities
SMTP delivery
Use SMTP for existing mail tooling and app frameworks. The site calls out compatibility with Rails, Django, Nodemailer, and Supabase, with STARTTLS and implicit TLS support.
MCP access
Connect through a remote MCP server for agentic clients. The docs and homepage point to Claude Desktop and Cursor, with the same quotas and governance as the other protocols.
Governed sending
Route new agents through a policy ladder before they can send broadly. Sandbox, supervised, trusted, and autonomous levels are backed by approval queues, allowlists, blocklists, and novel-recipient review.
Delivery and audit trail
Track mail through signed webhooks, retries, and a dead-letter queue. The docs also mention immutable audit logs and export formats such as CSV and NDJSON.
Deliverability and trust
Support deliverability and trust controls for custom domains. The site mentions managed domains, BYOC, DMARC, SPF, DKIM, BIMI, and a Verified Sender program with public registry details.
Where it fits
Agent-operated inboxes
Set up an agent that needs to send and receive email as part of an automated workflow, while keeping human oversight in the approval path for new recipients and policy changes.
App and framework integration
Connect existing applications or mail-capable frameworks to an agent mailbox through SMTP, especially when the stack already uses Rails, Django, Nodemailer, or Supabase.
Multi-agent operations
Run a team of agents under one owner with shared quotas, reputation tracking, and audit logs, instead of managing separate mail infrastructure for each worker.
Recipient-trust workflows
Publish a verified sender identity for higher-trust outbound mail, including public registry visibility and trust headers for recipients that inspect them.
Oversight and reporting
Monitor and review mail activity with webhooks, structured exports, and a leaderboard-style public directory for agents that should be visible to a broader audience.
Pros and Cons
Pros
- Supports three protocol paths — REST, SMTP, and MCP — so teams can fit different stacks without changing the underlying mailbox.
- Builds in governance from the start with sandboxing, approvals, recipient controls, reputation scoring, and audit logs.
- Includes deliverability and trust features such as custom domains, verified sender support, and a public registry.
- Offers a permanent free tier, with inbound mail, webhooks, and the claim flow included at every tier.
Cons
- The product is designed around governance, so teams that want fully open sending will need to work through approvals and policy states.
- Custom-domain, volume, and compliance features vary by tier, so larger deployments need to pick a plan that matches their workflow.
- The public materials describe several components and integrations, but the exact implementation details for every third-party workflow are not fully documented on the product pages provided.
FAQ
How does setup work for an AI agent?
MailMolt provides a skill file and API surface that an agent can fetch to self-onboard, then use the returned claim flow to get an address and permissions before sending mail. The docs show a quickstart where an agent is pointed at `skill.md`, registers itself through `POST /v1/agents`, and then the owner completes the claim step.
Which integrations and protocols does MailMolt support?
The docs and pricing page describe REST, SMTP, and MCP access. REST is the primary API, SMTP is intended for tools like Rails, Django, Nodemailer, and Supabase, and MCP is listed for Claude Desktop and Cursor.
How does MailMolt handle permission and oversight?
MailMolt uses a governance model that starts agents in sandbox and can move them through supervised, trusted, and autonomous states. Controls include approvals, allowlists and blocklists, novel-recipient gating, reputation scoring, spend and quota caps, and inbound injection detection.
How is MailMolt priced?
Pricing is tiered by outbound volume and custom domains, while inbound mail, webhooks, and the claim flow are free at every tier. The pricing page also notes that outbound overages are throttled rather than auto-charged.
Does MailMolt include a public reputation or trust registry?
The public explore page shows a live leaderboard of agents and activity counts, and the legal page describes a public trust registry entry for verified senders. Verified Sender also adds trust-header support and, for qualified plans, a refundable bond-based certification program.
Quick Facts
- Category
- AI agent email infrastructure
- Primary protocols
- REST, SMTP, MCP
- Primary users
- AI agents and the teams that supervise them
- Source domain
- mailmolt.com
- Pricing model
- Free tier plus paid plans; outbound volume and custom domains are the main priced resources
- Notable workflow
- Agent fetches `skill.md`, self-registers, then owner claims and authorizes the inbox
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