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Alternatives

Products that do what Sendmux does

Email API for AI agents with mailboxes and provider failover

  1. 1

    Email deliverability toolkit for humans and AI agents

    May 2026 · themailx.com

  2. 2

    Let your agents read, send, and react to email autonomously

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    Upstream977

    The inbox designed for humans and agents

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  4. 4

    Automatically draft Gmail replies that sound just like you

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    AgentMail275

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    Outerspan205

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  7. 7

    Email vibing in your Gmail / Outlook

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  8. 8

    Turn any email inbox into a native interface for AI agents

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  9. 9
    Volamail303

    Open source AI powered email for everyone

    2024

  10. 10AE

    Hey HN, we're Haakam, Michael, and Adi. We're building AgentMail (https://agentmail.to/), an API to give AI agents their own email inboxes. We’re not talking about AI for your email, this is email for your AI. We started building email agents because they can converse with users in their inboxes, automate email-based workflows, and authenticate with third-party applications. Given these unique capabilities, we think email will be a core interface for agents. But we were building on top of Gmail, which was a struggle: poor API support, expensive subscriptions, rate limits,…

    2025 · chat.agentmail.to

  11. 11

    Email API with built-in deliverability intelligence

    Apr 2026

  12. 12

    APIs to send automated interactive emails with forms

    2021

  13. 13
    Unspam AI385

    See how your subscribers read your emails with our AI inbox

    2024

  14. 14
    AI Emaily165

    Your AI inbox that writes like you + replies on autopilot

    Jul 2026 · aiemaily.com

  15. 15

    Resolve incoming email queries effortlessly with AI

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  16. 16

    AI Agents & Email deliverability experts on your team

    Jul 2026 · mailadept.com

  17. 17

    Inbox AI

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  18. 18

    The prototype of ambient agents

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  19. 19

    Let AI agents write & manage your SaaS emails

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  20. 20
    EzMail.AI115

    Reply to emails 10X faster with pre-filled drafts by AI

    2023

  21. 21

    Programmable email infrastructure for AI agents

    Apr 2026

  22. 22MF

    https://mailpilot.chat What is this? A local TUI (like Claude, Codex, Gemini, OpenCode or Copilot) that wraps your agent and sends each turn to an email in a nice format. What does it enable? It lets you email your agents. And them email you. So They Keep Working on the tasks you want, and You go and do What You Want. No need to stay at your desk. Be free. I built this for me, but thought others would find it useful, so I turned it into a product. I want get outside, and away from my desk, but still have the agents work. The accidental killer feature: You can CC your team. If you…

    Jan 2026

  23. 23AE

    Hi HN! We're Haakam, Michael, and Adi from AgentMail- a ycs25 company. We give AI agents their own email inboxes. Recently, we ran an experiment called Agent.Email. It's a signup flow designed specifically for AI agents instead of humans. The inspiration came from a few comments we received when we did our seed launch a few months back. They all came from the very apt observation that agents not being able to sign up to a product made for agents without human credentials was ironic and unideal. This is basically the thesis we built AgentMail on: The internet was made for humans exclusively,…

    May 2026

  24. 24

    Write AI-powered emails, summarize threads and attachments

    2023

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