Robotomail vs AgentMail for AI Agents

AgentMail and Robotomail are both purpose-built for AI agents. The key differences are in pricing model, agent autonomy, and enterprise features. This comparison helps you pick the right one for your use case.

Feature

AgentMail

Robotomail

Agent self-signup

Requires a human to create an account and generate API keys before the agent can operate.

Agent can sign up, provision a mailbox, and start sending with one API call. No human in the loop.

Inbound email

Webhooks and websockets for real-time inbound delivery.

Three delivery methods: HMAC-signed webhooks, SSE streaming, and polling.

Threading

Automatic threading with thread management via API.

Automatic threading via In-Reply-To and References headers, with subject-line fallback.

SDKs

Python and TypeScript SDKs, MCP server integration.

REST API from any language. CLI tool (@robotomail/cli) for debugging and tool-use.

Compliance

SOC 2 report access on Startup tier ($200/mo). SAML SSO on Enterprise.

No SOC 2 yet (early-stage). API key auth for all operations.

Pricing (free)

3 inboxes, 3,000 emails/month, 100 emails/day.

3 mailboxes, 5,000 sends/month, 100 sends/day per mailbox, 1 GB storage. No credit card required.

Pricing (paid)

$20/mo for 10 inboxes, $200/mo for 150 inboxes. Steep jumps between tiers.

Four tiers: Developer $19/mo (10 mailboxes, 2,000 inbound/mo), Growth $79/mo (50 mailboxes, 20,000 inbound/mo), Scale $199/mo (200 mailboxes, unlimited inbound). Unlimited monthly sends on Growth and Scale.

Custom domains

Available on paid plans. Up to 10 on Developer, 150 on Startup.

1 custom domain on Developer, 5 on Growth, unlimited on Scale. Auto-configured DKIM, SPF, and DMARC.

Where AgentMail fits better

AgentMail is the stronger choice for enterprise teams that need compliance certifications today. SOC 2 report access on the Startup tier, dedicated IPs, and SAML SSO on Enterprise are features Robotomail doesn't offer yet. If your buyer requires a security questionnaire with SOC 2 attached, AgentMail is the more mature option.

AgentMail also has typed Python and TypeScript SDKs with MCP server integration, which reduces boilerplate for teams already using LangChain, LlamaIndex, or CrewAI. If SDK ergonomics matter more than self-signup, AgentMail has the edge.

Where Robotomail fits better

Robotomail is built for agent autonomy. An agent can create its own account, provision a mailbox, and start sending without any human setup. This matters for platforms where agents spin up dynamically or where you want the agent to handle its own onboarding end-to-end.

Robotomail's four-tier model fills AgentMail's pricing gaps. At AgentMail, going from 10 to 15 inboxes jumps you from $20/mo to $200/mo. At Robotomail, 10 mailboxes is $19/mo on Developer, and 50 mailboxes is $79/mo on Growth, with unlimited monthly sends on Growth and Scale. Monthly inbound is tiered (100 on Free, 2,000 on Developer, 20,000 on Growth, unlimited on Scale), so you pay for the inbound volume you actually use.

Robotomail also offers SSE streaming as an inbound delivery method, which is useful for agents running locally or behind firewalls that can't expose a public webhook URL.

Common questions

Both are agent-native. What's the actual difference?

The biggest difference is the setup model. AgentMail requires a human to create the account and hand API keys to the agent. Robotomail lets the agent sign itself up. The second difference is pricing shape: AgentMail uses fixed tiers with steep jumps, Robotomail uses four tiers (Free, Developer, Growth, Scale) that scale more gradually.

Does AgentMail support agent self-signup?

No. A human needs to create an account, generate API keys, and configure the agent. The agent operates using credentials a human provisioned.

Which is cheaper for 20 mailboxes?

Robotomail at $79/mo on the Growth tier (up to 50 mailboxes, unlimited monthly sends, 20,000 inbound/mo). AgentMail would require the Startup tier at $200/mo since their Developer tier caps at 10 inboxes.

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