Side by side
robotomail vs sendmux
Plans read from both vendors' own pricing pages, with the same seats and billing applied to each. sendmux is a verified alternative to robotomail: it does the same main job for a similar customer.
Robotomail is an email infrastructure service designed specifically for AI agents, providing real email addresses that can be created and managed via a REST API with API-key authentication. It supports sending and receiving emails, automatic threading, and real-time inbound notifications through webhooks, SSE streaming, or polling.
- Starting price
- Free plan
- Price clarity
- Price clarity grade B, 75 out of 100 75 of 100
- Category
- Email & communication
- Platforms
- Accessible via REST API, CLI, and official SDKs in TypeScript/JavaScript, Python, Go, Ruby, and Rust.
- Good fit for
- AI developers and teams building autonomous agents that require email communication capabilities.. Users needing programmatic mailbox creation and management without traditional email service limitations.
- Limitations
- Free plan inbound and outbound email is limited to 10 sends and 10 receives per month and only between the agent and the verified email address.. Inbound mail beyond the monthly cap on free plans is discarded and not saved for later.
Sendmux is an email API designed for AI agents, providing real inboxes for sending and receiving emails through user-owned providers with automatic failover. It offers clean JSON parsing of inbound emails, multi-provider outbound routing, and tenant isolation for teams.
- Starting price
- Price not published
- Price clarity
- Not graded
- Category
- Email & communication
- Platforms
- Not confirmed
- Good fit for
- AI developers needing integrated email inboxes and sending capabilities for their agents.. Teams requiring multi-tenant email management with usage-based billing and provider flexibility.
- Limitations
- Free plan limits to two mailboxes and 50 accepted recipients daily across all outbound routes with fixed usage credit.. Higher managed daily sending limits are only available by review and not included in Free or Pro plans by default.
What each one costs your team
THE COST FOR YOUR TEAM
Go beyond the starting price.
Published plan prices for your team size and usage. Results update as you type. Taxes, currency conversion and unlisted add-ons are excluded, and anything the source did not state is called out rather than guessed.
Known monthly subtotal
$0.00/month
1 of 2 tools could not be priced with these inputs, so this is not the full cost.
| Tool / plan | Monthly | Per year | What this assumes |
|---|---|---|---|
FreeCheapest fit Flat subscription | $0.00 | $0.00 | Automatically extracted from the linked pricing source. Confirm usage, taxes and terms with the provider. |
| No pricing recorded yet. Check the official site, or ask the owner to add it. | |||
robotomail
Best fit
AI developers and teams building autonomous agents that require email communication capabilities.; Users needing programmatic mailbox creation and management without traditional email service limitations.
Trade-offs
Free plan inbound and outbound email is limited to 10 sends and 10 receives per month and only between the agent and the verified email address.; Inbound mail beyond the monthly cap on free plans is discarded and not saved for later.
Integrations / export
Works with AI agents such as Claude, Codex, Cursor, Grok Bot, OpenClaw, Hermes, and others via MCP connection., Supports sending and receiving emails with HTML bodies, custom headers, and attachments.
sendmux
Best fit
AI developers needing integrated email inboxes and sending capabilities for their agents.; Teams requiring multi-tenant email management with usage-based billing and provider flexibility.
Trade-offs
Free plan limits to two mailboxes and 50 accepted recipients daily across all outbound routes with fixed usage credit.; Higher managed daily sending limits are only available by review and not included in Free or Pro plans by default.
Integrations / export
Not confirmed
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