Dev tools · alternatives · 2026
24 alternatives to Sendmux
Email API for AI agents with mailboxes and provider failover
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Prices are shown for the 2 we have checked on their own sites, 2 of them free or with a free tier.
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Email deliverability toolkit for humans and AI agents
May 2026 · themailx.com · its alternatives →
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Let your agents read, send, and react to email autonomously
Jun 2026 · atomicmail.ai · its alternatives →
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inbound ▲227Hey HN! I've been working on Inbound (inbound.new) - an email system that lets you programmatically manage email addresses and route them to AI agents, webhooks, or forward them anywhere. The core idea: instead of manually managing email addresses, you create them on-demand via API and route incoming emails to your AI agents or other automated systems. For AI Agents: Create [email protected] and emails get sent to your AI agent as webhooks. Your agent can reply using our SDK. Perfect for AI customer support or automated responses. For Email Forwarding: Set up [email protected] to…
2025 · inbound.new · its alternatives →
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Turn any email inbox into a native interface for AI agents
Apr 2026 · blog.cloudflare.com · its alternatives →
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Supafaxfree tier, from $35/mo▲229Hey HN, We're building Supafax an agent that uses email as its memory and config store. Here's how it works: - You email yourself to talk to the agent - The agent uses that slice of your outbox as it's inbox and short term memory - It can insert emails into your inbox to store routines, reminders, and rules for itself Email is such a good primitive because it's essentially an append-only immutable record of all the valuable context about you and your relationships, and agents thrive on this highly structured surface. The tricky bit is users are very reluctant to share that data with…
Jun 2026 · supafax.com · its alternatives →
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- 11AE
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 · its alternatives →
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MailerLogic▲96Email API with built-in deliverability intelligence
Apr 2026 · mailerlogic.com · its alternatives →
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APIs to send automated interactive emails with forms
2021 · mailmodo.com · its alternatives →
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AI Emailyfree tier, from $14.99/mo▲165Your AI inbox that writes like you + replies on autopilot
Jul 2026 · aiemaily.com · its alternatives →
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Sendster AI▲96AI enabled newsletter software for Amazon SES, SMTPs
2023 · getsendster.in · its alternatives →
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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 · its alternatives →
- 20AE
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 · its alternatives →
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Robotomail provides email for AI agents, giving each agent a real mailbox it can create, send from, receive to, and manage via API. Provision mailboxes with one POST request, send and receive messages, and handle threading automatically. Get real-time inbound through webhooks or
May 2026 · robotomail.com · its alternatives →
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Feedback widget that routes to email, webhooks, or AI agents
May 2026 · github.com · its alternatives →
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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →