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AgentMail

The most recommended of 5 email APIs

Gives AI agents their own email inboxes through an API, with simple setup and no webhook plumbing; critics worry about spam abuse and the paid plan price.

Gives AI agents their own email inboxes through an API, with simple setup and no webhook plumbing; critics worry about spam abuse and the paid plan price.

72 people gave an opinion

recommend it
40
criticize it
32
approval share
56%
Each figure is one person. RecommendsCriticizes

Recommended in 10 of 13 months

  1. November 2025: not recommended
  2. December 2025: recommended
  3. January 2026: recommended
  4. February 2026: recommended
  5. March 2026: recommended
  6. April 2026: recommended
  7. May 2026: recommended
  8. June 2026: recommended
  9. July 2026: recommended
  10. August 2026: recommended
  11. September 2026: not recommended
  12. October 2026: not recommended
  13. November 2026: recommended (month in progress)

Why it doesn’t carry the badge

  • 40 people recommend itNeeds 10 or more, met.
  • 1.2 recommenders for every criticNeeds 2 to 1 or better, not met.
  • Recommended in 10 of 13 monthsNeeds 4 or more, met.

The same three rules apply to every product, and the badge can’t be bought. How the badge works

What people say about it

The reasons people give, with the number of comments that give each one. Open a reason to read what they said.

Why people recommend it

Each mark is one comment

  • Easy setup for agent inboxes

    “your UX is by far the simplest”

    Comment from 22 May 2026 in “Show HN: Agent.email – sign up via curl, claim with a human OTP”

    “API-first inbox provisioning, no CAPTCHA, reasonable pricing”

    Comment from 10 Mar 2026 on Hacker News

    “Sign-up was super smooth and the product is compelling.”

    Comment from 30 Jan 2026 in “Launch HN: AgentMail (YC S25) – An API that gives agents their own email inboxes”
  • Isolated inbox limits personal data risk

    “having an isolated identity + data within a separate agentic inbox also puts less risk of your personal email data being injected”

    Comment from 29 Jan 2026 in “Launch HN: AgentMail (YC S25) – An API that gives agents their own email inboxes”

    “tons of users do email through AgentMail which doesn't have access to your personal data”

    Comment from 11 Mar 2026 in “Show HN: Klaus – OpenClaw on a VM, batteries included”
  • Coordination between multi-agent workflows

    “letting agents communicate with each other using Agent Mail and file reservations”

    Comment from 30 Dec 2025 in “Show HN: Superset – Terminal to run 10 parallel coding agents”

    “solves a real coordination problem in multi-agent workflows”

    Comment from 29 Jan 2026 in “Launch HN: AgentMail (YC S25) – An API that gives agents their own email inboxes”

    “the agent-mail was part of its success and still getting some work to fix zookeeper type coordination problems”

    Comment from 16 Mar 2026 in “Show HN: AgentMailr – dedicated email inboxes for AI agents”
  • Automates 2FA and per-flow mailboxes

    “Just automating 2FA alone is worth the gold.”

    Comment from 29 Jan 2026 in “Launch HN: AgentMail (YC S25) – An API that gives agents their own email inboxes”

    “The idea is pretty solid, automation platforms often provision a mailbox per flow for this reason”

    Comment from 29 Jan 2026 in “Launch HN: AgentMail (YC S25) – An API that gives agents their own email inboxes”

What people warn about

Each mark is one comment

  • Spam and abuse concerns

    “Guaranteed this is going to attract a ton of abusers who are looking to use this for signing up to services, spamming or other nefarious purposes”

    Comment from 29 Jan 2026 in “Launch HN: AgentMail (YC S25) – An API that gives agents their own email inboxes”

    “Having a domain oriented toward AI e-mail sending feels like a fast path straight to spam block lists.”

    Comment from 21 May 2026 in “Show HN: Agent.email – sign up via curl, claim with a human OTP”

    “This looks like one of the easiest way to get your domain blacklisted in all the email providers.”

    Comment from 21 May 2026 in “Show HN: Agent.email – sign up via curl, claim with a human OTP”
  • Services may block agent signups

    “a lot of service would block signups with this agent domain as they require real human users”

    Comment from 23 May 2026 in “Show HN: Agent.email – sign up via curl, claim with a human OTP”

    “It's less work to signup a second email address for agent use than to signup with you”

    Comment from 22 May 2026 in “Show HN: Agent.email – sign up via curl, claim with a human OTP”
  • Paid plan seems poor value

    “I find the subscription to be a bit expensive for my hobby, but it's a nice service if you do this professionally.”

    Comment from 1 Nov 2026 in “TCP Use-After-Free: CVE-2026-98432 / CVSS 9.8”

    “I'm just not seeing why anyone would buy a paid plan for this when they could buy a domain for <$10”

    Comment from 21 May 2026 in “Show HN: Agent.email – sign up via curl, claim with a human OTP”
  • Website slow or broken

    “The website is really bad. If one moves from Python to curl in the website, one really sees how much noticable lag there is.”

    Comment from 29 Jan 2026 in “Launch HN: AgentMail (YC S25) – An API that gives agents their own email inboxes”

    “Application error: a client-side exception has occurred while loading www.agentmail.to”

    Comment from 30 Jan 2026 in “Launch HN: AgentMail (YC S25) – An API that gives agents their own email inboxes”

Other email APIs people recommend

The four most recommended other email APIs, with the same counts for each, so you can compare like for like. The tick on each bar marks the 2 to 1 line the badge needs.

AgentMail compared with 4 alternatives
ProductRecommendCriticizeApprovalMonthsOwnedBadge
AgentMailThis page403256%10——
Resend12957%8——
Mailgun8562%6——
SendGrid82822%510 yrs3 owners—
Posthorn5183%1——
See all 5 email APIs, ranked

What people said

40 of the 89 comments that mention it, newest first. Each links to the original comment.

“I find the subscription to be a bit expensive for my hobby, but it's a nice service if you do this professionally.”

MixedComment from 1 Nov 2026 in “TCP Use-After-Free: CVE-2026-98432 / CVSS 9.8”

“it enables agents to message each other. It's a lot of fun to drop in on their conversations”

RecommendsComment from 28 Jul 2026 in “Messaging platform I can self-host for my agents to communicate”

“or https://github.com/Dicklesworthstone/mcp_agent_mail_rust efforts”

RecommendsComment from 26 Jun 2026 in “Ask HN: How did you set up a multi-agent orchestration for personal use?”

“Other than that, it works perfectly and runs on his machine on a schedule.”

MixedComment from 12 Jun 2026 in “Slightly reducing the sloppiness of AI generated front end”

“a lot of service would block signups with this agent domain as they require real human users”

CriticizesComment from 23 May 2026 in “Show HN: Agent.email – sign up via curl, claim with a human OTP”

“It's less work to signup a second email address for agent use than to signup with you”

CriticizesComment from 22 May 2026 in “Show HN: Agent.email – sign up via curl, claim with a human OTP”

“It's made email dead simple for agents and testing any paths for email.”

RecommendsComment from 22 May 2026 in “Show HN: Agent.email – sign up via curl, claim with a human OTP”

“your UX is by far the simplest”

MixedComment from 22 May 2026 in “Show HN: Agent.email – sign up via curl, claim with a human OTP”

“So __much__ value is in the fact things are easy. Money is __not__ the most valuable thing in the world.”

RecommendsComment from 22 May 2026 in “Show HN: Agent.email – sign up via curl, claim with a human OTP”

“I'm just not seeing why anyone would buy a paid plan for this when they could buy a domain for <$10”

CriticizesComment from 21 May 2026 in “Show HN: Agent.email – sign up via curl, claim with a human OTP”

“Having a domain oriented toward AI e-mail sending feels like a fast path straight to spam block lists.”

MixedComment from 21 May 2026 in “Show HN: Agent.email – sign up via curl, claim with a human OTP”

“This looks like one of the easiest way to get your domain blacklisted in all the email providers.”

CriticizesComment from 21 May 2026 in “Show HN: Agent.email – sign up via curl, claim with a human OTP”

“Other email providers ban email accounts created for agents, while that is what AgentMail is designed for.”

RecommendsComment from 21 May 2026 in “Show HN: Agent.email – sign up via curl, claim with a human OTP”

“I've already received spam email from AI agents using a seeming competitor to this (agentmail.to)”

CriticizesComment from 21 May 2026 in “Show HN: Agent.email – sign up via curl, claim with a human OTP”

“I've been very happy with agentmail.to for a while with great success.”

RecommendsComment from 16 Apr 2026 in “Cloudflare Email Service: now in public beta. Ready for your agents”

“the agent-mail was part of its success and still getting some work to fix zookeeper type coordination problems”

RecommendsComment from 16 Mar 2026 in “Show HN: AgentMailr – dedicated email inboxes for AI agents”

“Feels like something like this could become part of the identity layer for agents, not just email. Nice idea.”

RecommendsComment from 15 Mar 2026 in “Show HN: AgentMailr – dedicated email inboxes for AI agents”

“tons of users do email through AgentMail which doesn't have access to your personal data”

RecommendsComment from 11 Mar 2026 in “Show HN: Klaus – OpenClaw on a VM, batteries included”

“API-first inbox provisioning, no CAPTCHA, reasonable pricing”

RecommendsComment from 10 Mar 2026 on Hacker News

“the long-polling approach means your agent just blocks on one call instead of polling. no webhook server to maintain, no correlation logic to wire up”

RecommendsComment from 28 Feb 2026 in “Show HN: AgentMailr – Real email addresses for AI agents (OTP/2FA handling)”

“Their agent mail was great & very early in agent orchestration.”

RecommendsComment from 25 Feb 2026 in “Pi – a minimal terminal coding harness”

“I forked agent-mail, added heartbeat/presence tracking, had a PR upstream”

RecommendsComment from 6 Feb 2026 in “Claude Opus 4.6”

“Sign-up was super smooth and the product is compelling.”

RecommendsComment from 30 Jan 2026 in “Launch HN: AgentMail (YC S25) – An API that gives agents their own email inboxes”

“Application error: a client-side exception has occurred while loading www.agentmail.to”

CriticizesComment from 30 Jan 2026 in “Launch HN: AgentMail (YC S25) – An API that gives agents their own email inboxes”

“Regardless our API is way more agent friendly and I think your Clawdbot would agree.”

RecommendsComment from 29 Jan 2026 in “Launch HN: AgentMail (YC S25) – An API that gives agents their own email inboxes”

“We rate-limit, isolate, or revoke bad actors without poisoning unrelated senders.”

RecommendsComment from 29 Jan 2026 in “Launch HN: AgentMail (YC S25) – An API that gives agents their own email inboxes”

“solves a real coordination problem in multi-agent workflows”

RecommendsComment from 29 Jan 2026 in “Launch HN: AgentMail (YC S25) – An API that gives agents their own email inboxes”

“having an isolated identity + data within a separate agentic inbox also puts less risk of your personal email data being injected”

RecommendsComment from 29 Jan 2026 in “Launch HN: AgentMail (YC S25) – An API that gives agents their own email inboxes”

“The website is really bad. If one moves from Python to curl in the website, one really sees how much noticable lag there is.”

CriticizesComment from 29 Jan 2026 in “Launch HN: AgentMail (YC S25) – An API that gives agents their own email inboxes”

“Just automating 2FA alone is worth the gold.”

RecommendsComment from 29 Jan 2026 in “Launch HN: AgentMail (YC S25) – An API that gives agents their own email inboxes”

“Guaranteed this is going to attract a ton of abusers who are looking to use this for signing up to services, spamming or other nefarious purposes”

CriticizesComment from 29 Jan 2026 in “Launch HN: AgentMail (YC S25) – An API that gives agents their own email inboxes”

“The idea is pretty solid, automation platforms often provision a mailbox per flow for this reason”

RecommendsComment from 29 Jan 2026 in “Launch HN: AgentMail (YC S25) – An API that gives agents their own email inboxes”

“it really works as a mean to communicate much easier with an agent”

RecommendsComment from 29 Jan 2026 in “Launch HN: AgentMail (YC S25) – An API that gives agents their own email inboxes”

“I'd rather just give my agent an inbox where I know it can communicate with the other billions of people”

RecommendsComment from 29 Jan 2026 in “Launch HN: AgentMail (YC S25) – An API that gives agents their own email inboxes”

“It lets agents plug into the same trust systems the web already uses!”

RecommendsComment from 29 Jan 2026 in “Launch HN: AgentMail (YC S25) – An API that gives agents their own email inboxes”

“We are using AgentMail for sourcing quotes here at scale with various top shippers.”

RecommendsComment from 29 Jan 2026 in “Launch HN: AgentMail (YC S25) – An API that gives agents their own email inboxes”

“Inboxes have threads, threads have messages, messages have attachments.”

RecommendsComment from 29 Jan 2026 in “Launch HN: AgentMail (YC S25) – An API that gives agents their own email inboxes”

“Appreciate that your enterprise options include Bring Your Own Cloud, that makes things much easier for us.”

RecommendsComment from 29 Jan 2026 in “Launch HN: AgentMail (YC S25) – An API that gives agents their own email inboxes”

“In the future all the agent communication will be using agentmail!”

RecommendsComment from 29 Jan 2026 in “Launch HN: AgentMail (YC S25) – An API that gives agents their own email inboxes”

“letting agents communicate with each other using Agent Mail and file reservations”

RecommendsComment from 30 Dec 2025 in “Show HN: Superset – Terminal to run 10 parallel coding agents”

Counts come from 1,795,640 Hacker News comments, November 2025 to November 2026. How we count. Report a mistake.