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AppSumo Radar beta
Radar products are early-stage listings that are managed by the team who built the product.Learn more about Radar

Email as webhook, send via one API

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MailKite

Micro-SaaS
-80%$49
$240
  • Lifetime access
  • Refundable up to 60 days
No "We Got Your Back" guarantee. Radar is a discovery engine — we don't vet these products, so this guarantee doesn't apply.
AppSumo's 60-day refund applies to most deals. AI skills are non-refundable once redeemed.
AppSumo Labs

Early-stage product. Brought to you by the team who built it.

Spinning up email for a new product usually means a mail server, DNS records, and per-domain fees. MailKite turns inbound mail into a webhook and outbound into one API call, across unlimited domains.

TL;DR

  • checkmarkReceive email as signed JSON on your webhook
  • checkmarkSend from one API call across unlimited domains

At-a-glance

mailkite.dev

Alternative to

Gmail, SendGrid, Resend

Integrations

HubSpot, Shopify, WordPress, Zapier

Best for

Developers, Remote teams, SaaS

Everything email needs, on one account

Inbound email lands on your webhook as signed JSON

  • Point a domain at MailKite and every message to it is parsed and POSTed to your endpoint as clean JSON
  • Verify the sender with an HMAC-SHA256 signature on every request, so nothing unsigned gets acted on
  • Fetch attachments from short-lived signed URLs instead of decoding MIME yourself
  • Dedupe safely with a stable message id that stays the same across retries
Inbound email lands on your webhook as signed JSON

Send from one API call, in any language

  • Call POST /v1/send with a to, a from, a subject and a body, and get a delivery id back
  • Use the SDKs for Node, Python, Ruby, PHP, Go and more, or drive it from the CLI
  • Thread replies by passing inReplyTo, so a conversation stays one conversation
  • Stay aligned because SPF, DKIM and DMARC are configured and monitored per domain
Send from one API call, in any language

Give every AI agent its own inbox

  • Connect over MCP at mcp.mailkite.dev and the agent sends, reads and replies with no key to copy
  • Hand out an address per agent so a coding agent can receive its own verification codes and reset links
  • Auto-triage by tagging, routing and replying as any address on the domain
  • Keep humans in the loop with a shared inbox that shows what every agent did
Give every AI agent its own inbox

Deliverability handled, not configured

  • Watch one health score for the whole account, with bounces, complaints and inbound volume on the same screen
  • Route automatically across Cloudflare, Amazon SES and Postmark, whichever places that message best
  • Send from warmed IPs instead of a cold shared pool
  • Catch problems early with per-domain delivery logs and a live status page
Deliverability handled, not configured

Choose the plan that’s right for you

Feel secure in your purchase with AppSumo's 60 day money-back guarantee.

Solo

$49
Lifetime access
10,000Outbound emails per month
1,000Daily send limit
30 daysMessage retention
-Dedicated IP
Add-onWebmail seats
EmailSupport
SSO

Studio

$99
Lifetime access
25,000Outbound emails per month
1,000Daily send limit
90 daysMessage retention
Add-onDedicated IP
Add-onWebmail seats
PrioritySupport
SSO

Agency

$199
Lifetime access
50,000Outbound emails per month
2,000Daily send limit
365 daysMessage retention
Add-onDedicated IP
IncludedWebmail seats
PrioritySupport
SSO
Refundable up to 60 daysNot covered by We Got Your Back. Why?
Deal terms & conditions
MailKite
See MailKite
Founded March 24, 2026
🇺🇸Sheridan, Wyoming, USA
1-10
Startup
Bootstrapped
mailkite.dev

Why I built MailKite

I keep shipping small products, and every one of them needed email. Each time it was the same week of work: pick a provider, add DNS records for another domain, wire up a separate inbound parser, then find a different library to send. The bill arrived per domain, so a side project sending twenty emails a month cost as much as one sending twenty thousand.

MailKite is the account I wanted instead. Point a domain at it and both directions work: inbound arrives as signed JSON at a webhook, outbound is one API call, and domains are free, so a new product never costs more than the last. The next piece is agents, which now get their own inboxes over MCP and can catch a verification code without a human in the loop. The goal is boring infrastructure you stop thinking about.

Gabe LG
Gabe LG

What “Radar” means for this product

Learn more about AppSumo deals

Radar is home to early-stage products looking to gain traction. Here’s the lowdown of what these deals are and aren’t.

Where it is in its life

Radar products are at the start of their journey. They're fresh on the scene and building a customer base.

How we vouch for it

We've verified the basics and reviewed the listing for safety. Success isn't guaranteed — we haven't fully vetted every claim, feature, or result.

Code & security review

All AI skills are reviewed for security purposes. We do not review software code — partner owns security and what ships.

Refund policy

60-day refund on most deals. AI skills are non-refundable once redeemed.

Pricing

Prices are set by the founder. Simple as that.

Where you'll see it

The Radar section of our site exclusively. These products are in early discovery and not quite ready for the AppSumo limelight yet.

Radar is a discovery engine — because we aren’t vetting these products, our We Got Your Back guarantee doesn’t apply. Should these products show traction, our team will work with theirs to get them ready for the main stage (and protected).

Questions & reviews