
Sequenzy
MailChimp
Klaviyo
Robotomail
Customer.io
Mails.ai
Resend
Email inbox API for AI agents. Create agent mailboxes, receive live inbox events, and send through Gmail, Outlook, SMTP, or managed Amazon SES with quotas and failover.

Sync and forward messages between Discord and Telegram automatically. Supports Discord-to-Discord and Telegram-to-Telegram forwarding too.

Website, pricing, platforms and company facts side by side.
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| Website | sendmux.ai | forwardmsg.com |
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| Platforms | — | |
| Company | Startup from Australia · 1 - 9 employees · 2026 | Startup from the United States · 2025 |
| Listed in |
In their own words, as submitted to SaaSHub.


Sendmux is the email inbox API for AI agents. Give an agent its own mailbox, then let it receive email, read threads, inspect attachments, send replies, and react to new messages as they arrive. Each mailbox can return cleaned message content for agents, raw email when needed, signed webhooks,...
ForwardMsg is a powerful message forwarding tool that automatically syncs messages between Discord and Telegram. Whether you need Discord-to-Telegram, Telegram-to-Discord, or even Discord-to-Discord and Telegram-to-Telegram message forwarding, ForwardMsg delivers real-time, reliable performance....
What each product offers, as listed by its team.


Possible disadvantages
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Why this product is good
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Overall verdict
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Walkthroughs and reviews on video.
Email Inbox API for AI Agents: Inboxes, Sending, SSE, MCP
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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Sendmux.ai and ForwardMsg.
Sendmux.ai's answer
Publicly, Sendmux is built around REST and OpenAPI APIs, SMTP, IMAP, signed webhooks, Server-Sent Events, Model Context Protocol, SDKs for TypeScript, Python, Go, PHP, and Ruby, the sendmux CLI, and installable Sendmux Skills for agent workflows.
Sendmux.ai's answer
Sendmux combines an email inbox API for AI agents with multi-provider outbound sending. Agents get dedicated mailboxes, mailbox-scoped API keys, cleaned message content, threads, attachments, signed webhooks, SSE live inbox events, and sending through Gmail OAuth, Outlook OAuth, SMTP, or managed Amazon SES with quotas, weighted routing, and failover.
Sendmux.ai's answer
Choose Sendmux if you need both inbound agent mailboxes and outbound provider control. Sending-only APIs do not give agents a real inbox, and mailbox-first tools usually do not offer bring-your-own-provider routing, per-provider quotas, and failover. Sendmux gives teams one control plane for inboxes, sending, events, providers, logs, domains, billing, MCP, SDKs, Skills, and CLI access.
Sendmux.ai's answer
Sendmux is built for AI agent product teams, automation agencies, and platform builders that need agents to send, receive, route, and react to email in production. It also fits teams using their own Gmail, Outlook, or SMTP providers for controlled outbound and cold email workflows from AI tools.
Sendmux.ai's answer
Sendmux came from a simple problem: production AI agents need real email, not a hacked shared inbox. Teams were stitching together sending providers, mailboxes, parsers, webhook services, routing logic, and billing. Sendmux puts agent email identity, inbound mail, outbound sending, live events, and provider control into one API-first platform.
Sendmux.ai's answer
Target Markets, CFC, Aurora Capital
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