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Developer Tools
A notebook for your AI sessions, scripts and agents
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Sendmux
Email inbox API that gives AI agents dedicated mailboxes
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About Sendmux
Sendmux gives AI agents a real email identity through one API: dedicated inbound mailboxes, multi-provider outbound sending via SMTP, Gmail, Outlook or managed Amazon SES, plus routing, quotas and failover. Developers get REST APIs, SDKs, a CLI, MCP tools, signed webhooks and live Server-Sent Events for inbox activity.
Sendmux website preview
Live preview of sendmux.com via the WordPress mShots service — it can take a few seconds to generate on a first visit.
Sendmux: strengths & things to check
Strengths
- Free tier available — you can start without paying (freemium model).
- Covers email api, ai agents, developer tools, mcp, smtp — see the focus areas listed in its key facts.
- Has 6 close alternatives in the same category on this page, so switching or comparing is easy.
Things to check
- The full feature set sits behind a paid plan — check which limits the free tier carries on the official site before committing.
- Current plan prices are not listed here (they change too often to print reliably) — confirm the exact price on the official site.
- It is one of 1288 tools in the Developer Tools category here — compare it against the alternatives below before you commit.
Derived from this listing's own data (pricing model, focus areas and category) — not a hands-on review score.
Sendmux pricing
| Pricing model | Freemium — a free tier lets you start, and paid plans are available if you need more. |
|---|---|
| Free access | Yes — free tier, paid upgrades available |
| Current plan prices | Listed on the official site — prices change, so this directory links out instead of printing a number that may already be stale. |
| Official site | sendmux.com |
Sendmux key facts
- Category: Developer Tools
- Pricing: Freemium — a free tier lets you start, and paid plans are available if you need more.
- Focus areas: email api, ai agents, developer tools, mcp, smtp
- Official site: sendmux.com
Sendmux FAQ
How much does Sendmux cost?
Freemium — a free tier lets you start, and paid plans are available if you need more. Current plans and prices are listed on the official site (sendmux.com).
What is Sendmux used for?
Email inbox API that gives AI agents dedicated mailboxes Its focus areas in the Developer Tools category: email api, ai agents, developer tools, mcp, smtp.
Where can I try Sendmux?
On its official site, sendmux.com — the Visit Official Site button above goes straight there.
Sendmux vs alternatives
| Sendmux | Fresh Jots | Merge | Agentprobe | |
|---|---|---|---|---|
| Pricing | Freemium — a free tier lets you start, and paid plans are available if you need more. | Freemium — a free tier lets you start, and paid plans are available if you need more. | Freemium — a free tier lets you start, and paid plans are available if you need more. | Free — listed in this directory as a free tool, with no paid plan required to use it. |
| Focus areas | email api, ai agents, developer tools, mcp, smtp | ai agents, logging, notes, mcp | unified api, integrations, ai agents, mcp | ai agents, ecommerce, audit |
| Official site | sendmux.com | freshjots.com | merge.dev | agentprobe.fly.dev |
| Directory status | Listed | Listed | Listed | Listed |
Side-by-side from each listing's own directory data. Full alternative cards are below.
About the Developer Tools category
Editors, platforms, and services developers rely on to build and ship software. The Developer Tools category on Tools Hub currently lists 1288 tools. Alongside Sendmux, it includes Fresh Jots, Lazydocker, GitUI, Delta.
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