AI · alternatives · 2026
24 alternatives to MailCat – Email service for AI agents (open-source)
Hi HN, I built MailCat because my AI agents kept getting stuck at "please verify your email." The key insight: if your AI agent can read documentation, it can set itself up. Just paste this into Claude Code, OpenClaw, or any AI agent: "Read https://mailcat.ai/skill.md and set up a MailCat mailbox for yourself. Save the token securely." That's it. Your agent reads the skill.md, creates a mailbox via API, and handles email verification autonomously from there. What it does: - Instant mailbox creation via API - Verification codes auto-extracted from emails - 1-hour retention…
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 1 we have checked on their own sites, 1 of them free or with a free tier.
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Let your agents read, send, and react to email autonomously
Jun 2026 · atomicmail.ai · its alternatives →
- 2AE
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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- 4AE
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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MailMolt▲93Give your AI agent its own verified email address — not access to yours. Send and receive via REST, SMTP, or MCP. Built for LangGraph, CrewAI, Mastra, Claude Code, Cursor. Human-in-the-loop approval, trust scores, GDPR-ready.
Feb 2026 · mailmolt.com · its alternatives →
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MailTester.AI▲327Forward an email and get an AI deliverability report in 30s
2025 · mailtester.ai · its alternatives →
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The prototype of ambient agents
2025 · agentinbox.ai · its alternatives →
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Supamail AI▲214I run multiple projects and D2C brands, which means I manage 6 different Gmail accounts and easily get 100+ emails a day - team updates, invoices, customer queries, newsletters, OTPs… everything mixed together. After missing a few important emails that actually cost me money, I realized the problem wasn’t the number of emails, it was how hard it was to make sense of them. So I built Supamail, an AI-powered inbox that helps you read less and understand more. Here’s what it does: - Emails in last 24 hrs shrink into clear summaries, smart categories, and easy replies so you never feel…
2025 · supamail.co · its alternatives →
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AI Agents & Email deliverability experts on your team
Jul 2026 · mailadept.com · its alternatives →
- 11NI
Hi HN! My co-founder and I spent the last 4 weeks building something we desperately needed ourselves. The Problem: We spend hours processing emails - scheduling meetings, going through long newsletters, downloading attachments to review, verifying documents like invoices, and of course taking actions on external systems (Salesforce, Asana, Jira etc) based on emails received. A lot of this can be automated with the help of AI agents, saving several hours every week. Our Solution: Forward any email to a specialized AI agent that completes the task and email you back the results. No…
2025 · mxtoai.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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AI Mailbox▲10AI Mailbox lets AI agents create disposable email inboxes with one command – no signup required. $ aimailbox create → Email: [email protected] $ aimailbox list x7k2m $ aimailbox read x7k2m 1 Built for the problem every AI agent builder faces: email verification during automated signups. - Permissionless (no registration needed) - CLI-first with JSON output - Auto-extracts verification codes - Receive-only (no spam abuse) Built on Cloudflare Email Workers. Open source. Github: https://github.com/ted2048-maker/aimailbox Web Demo: https://aimailbox.pinit.eth.limo
Jan 2026 · aimailbox.dev · 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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Nitrosend▲168Email for AI agents. They sign up, send and reply.
Jul 2026 · nitrosend.com · its alternatives →
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Dirac▲128It all started 4 months ago during my last startup. Even with barely any traction, I was getting about 20 emails a day. Some from cold randoms, some internal, some from prospects. And I just wasted so much time in my inbox. The current solutions? Superhuman and HEY. Sure they're pretty but the ai is just an after thought. And the tool that was supposed to help me just makes me, my own assistant. So I went and built Dirac. We're launching in 8 hours, https://www.producthunt.com/products/dirac-3?launch=dirac-4
Jun 2026 · dirac.app · its alternatives →
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CalBot▲115Carly lets you create custom AI agents with 120+ integrations. Give each agent an inbox, instructions, and tool access for email, CRM, scheduling, research, and operations.
2025 · calbotservice.com · its alternatives →
- 18
I kept running into the same problem while building AI agents: every agent that needs email ends up sharing my personal inbox or a single company domain. That breaks attribution, creates deliverability risk, and makes it impossible to test sender identities per agent. So I built AgentMailr. You call an API to create an inbox, your agent gets a unique email address, and replies route back to that specific agent. Works for both inbound (OTP parsing, reply routing) and outbound (cold email, notifications). Bring your own domain is supported so emails come from your domain, not ours. REST API…
Mar 2026 · agentmailr.com · its alternatives →
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Mailgent▲51Give your AI agent a real inbox, vault, calendar, and verifiable identity — plus a USDC wallet to pay for what it uses. One API.
Jun 2026 · mailgent.dev · its alternatives →
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The AI email writer that Google wishes they built
2024 · chromewebstore.google.com · its alternatives →
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Find emails for any website the 2023 way (with AI of course)
2023 · chromewebstore.google.com · 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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Sparks AI▲128Hi Hacker News, we just launched our beta for Sparks AI. Sparks AI is a platform for building, sharing, and monetizing your AI assistants using app integrations and multiple LLMs. We're still working out the kinks and would love to get your feedback. We also have a discord: https://discord.gg/bdWknpfVKX We’re trying to get our initial users to serve personally and hope that you give us a shot. Thank you
2025 · getsparks.ai · 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 →