Mektup is programmable email infrastructure: real inboxes on any domain you own that a person, your team, an AI agent, and even your own SaaS customers can all use. Send transactional mail - verifications, receipts, notifications - through a simple API, and receive the replies in real mailboxes. One platform, fully managed. No servers to run, no two services to stitch together. No coding required - if you own a domain, you can set it up yourself in a few clicks - or let your AI coding agent do it.
Free tier: 1 domain, 3,000 emails/month, 300 a day. No credit card required.
Open source & MIT-licensed - inspect the MCP server or clone the AI inbox-agent example on GitHub
You can ship a full SaaS with Lovable, Bolt, or Cursor in a weekend and buy a domain in thirty seconds. Getting real email working on that domain is still more of a hassle than it should be - the address that sends your sign-up confirmations and the inbox that catches the replies usually come from two different places. Same story if you're not building an app at all - just a person, a small business, or a side project with a domain that needs a real inbox, no code involved.
The old way is overkill you don't need or two services stitched together: a webhotel or office suite for a mailbox, plus a separate sending API for outbound - set up again for every domain. Mektup does both halves on your own domain in one fully-managed place, keeps every domain you own under a single login, and is built so an AI coding agent can set it up as easily as you can.
Send transactional email - verifications, receipts, notifications - through a simple REST API, and receive replies and leads in a real mailbox on that same address. Both directions, on real mail infrastructure, not a one-way relay.
A real MCP server: your agent registers the domain, gets the DNS records, creates the mailbox, and sends the first email, all inside its own session. Configure a webhook and it gets notified the instant new mail arrives, instead of polling.
Every domain gets a real DKIM keypair and the exact records to add. No key management, no guessing what a DNS provider expects.
Every client project, every side project, every domain you own, one dashboard and one API key across all of them.
Threaded conversations, search, drafts, folders, forwarding, vacation replies. Everything a normal inbox has, not a stripped-down logs viewer.
No MCP client? The same operations are a documented REST API or a CLI, nothing here is locked to one tool.
Through the dashboard, the API, or ask your agent to. You get back the exact MX, SPF, DMARC, and DKIM records.
At whatever registrar or DNS host you already use. Mektup never touches your DNS itself, it only ever tells you what to add.
Real mail, in the Mektup dashboard, in Outlook or Apple Mail over IMAP, or straight through the API from your own code.
Most tools give you one half: a sending-only API can't receive mail at all, and a webhotel or office suite is far more than you need (and has no API for your agents). Mektup sends, receives, and gives your app and your AI agents an API - on the domains you already own.
| Feature | Mektup | Webhotel | Google Workspace | Resend / Web3Forms |
|---|---|---|---|---|
| Receive email (real inbox) | Yes | Yes | Yes | Webhook only, no mailbox |
| Send from your domain | Yes | Yes | Yes | Yes |
| Built-in contact forms | Yes | Sometimes | No | Forms only |
| Many domains, one account | Yes | Rarely | Per-domain billing | Yes |
| Web hosting you may not use | No | Yes | No | No |
| API, CLI and MCP for AI agents | Yes | No | Limited | API only |
| Starts at | Free | Paid | Per user / mo | Free tier |
Every capability is a documented HTTP endpoint too, for whatever isn't running through an agent.
# send real mail from a domain you registered curl -X POST https://api.usemektup.com/v1/emails \ -H "Authorization: Bearer mek_live_..." \ -H "Content-Type: application/json" \ -d '{ "from": "hello@yourstartup.com", "to": "someone@gmail.com", "subject": "It works", "text": "Real mail, sent through Mektup." }'
Upgrade or cancel anytime from your dashboard. By creating an account you agree to our Terms, Acceptable Use Policy, and Privacy Policy.
No. If you own a domain, you can register it, add the DNS records Mektup gives you, and create a mailbox entirely by clicking through the dashboard - no code, no command line. It works exactly like a normal email inbox from there: webmail, or add it to Outlook, Apple Mail, or your phone over IMAP/SMTP. The REST API, MCP server, and CLI are there if you build software or use an AI agent, but they're optional - plenty of people use Mektup as nothing more than a real inbox on their own domain.
Yes. Mektup has a full REST API (and matching MCP tools) for sending - a single POST fires a verification code, receipt, welcome email, or notification from your domain, authenticated with real DKIM, SPF, and DMARC. It does the transactional-sending job most email APIs stop at, and because it also receives, replies to those emails land in a real inbox instead of vanishing. One platform for both, fully managed.
It's fully hosted and managed by Mektup - you never run, install, or configure a server. Mektup operates its own mail infrastructure (that's what "own infrastructure" means - not a thin resell of another provider, and not something you self-host). You sign up, add a few DNS records for a custom domain, and use it.
Yes - that is exactly what Mektup is for. You don't need a full webhotel (web hosting) just to get email on your domain. Point your domain's MX records at Mektup and you have real inbound and outbound email, without paying for hosting you won't use. More in our webhotel alternative guide.
Register your domain in Mektup, add the MX, SPF, DKIM, and DMARC records it gives you at your DNS host, and create a mailbox like hello@yourdomain.com. From then on it receives real mail from anyone, readable in Mektup's webmail or any IMAP client. See the step-by-step email for your domain guide.
Yes. Every mailbox works over standard IMAP and SMTP, so you can add hello@yourdomain.com to Outlook, Apple Mail, Thunderbird, or your phone, alongside Mektup's own webmail dashboard.
Usually, yes. A webhotel bundles web hosting you may not need. Mektup is email plus contact forms only, starting free for one domain and $20/month for more, so you pay only for the part you actually use.
Both. Mektup runs real mail infrastructure behind the API, so a mailbox you create receives real mail from anyone, not just fires off transactional sends. Read it in Mektup's own dashboard, or in Outlook, Apple Mail, or Thunderbird over real IMAP and SMTP.
Yes. Mektup ships a real MCP server with tools covering the whole platform. An agent like Claude Code or Cursor can register a domain, walk through DNS setup, create a mailbox, and send the first email, all inside its own session.
Yes - that's a core use case. One Mektup mailbox is a real inbox both a human and an AI agent operate at once: the agent reads, triages, drafts, and replies over the REST API or MCP, while you and your team work the same mailbox in Mektup's webmail or in Outlook and Apple Mail over IMAP/SMTP. Let the agent handle routine mail and take over any thread yourself. More in the shared inbox for humans and AI agents guide.
Yes. Mektup is multi-tenant email infrastructure, so your SaaS can provision a real, isolated inbox for each of its own customers through the API or MCP, while your app and its AI agents keep controlled, scoped access. Each customer sees only their own mailbox - never your other domains, your account, or each other's mail. See the multi-tenant email guide.
Yes, for the shared human-and-agent case specifically. AgentMail gives an AI agent a disposable, API-only inbox with no interface for a person to read it. Mektup gives you a real business mailbox on your own domain that both you and your AI agent use at once - the agent connects over the same REST API and a native MCP server, while you get IMAP/SMTP in Outlook, Apple Mail, or Mektup's own webmail, plus team logins.
Yes. The REST API and MCP server let an agent register a domain, create a mailbox, send mail, and read incoming replies and threads on its own - the same operations available in the dashboard are native MCP tool calls, so an agent like Claude Code, Cursor, or Lovable can hold a full back-and-forth conversation inside its own session.
No. Mektup runs and operates the mail infrastructure. You register a domain and get a mailbox, nothing to install, patch, or keep online yourself.
Mektup never touches it. Registering a domain returns the exact records to add, and you, or your agent, add them at whatever registrar or DNS host you already use.
Yes. 1 domain, 3,000 emails a month, 300 a day, 3GB of storage, no credit card required.
It can react automatically. Every mailbox supports a webhook that fires an HMAC-signed POST the moment new mail arrives, with the sender, subject, and body already in the payload - an agent doesn't need to poll the API to find out something new landed.
This form is powered by Mektup's own forms feature - submissions land straight in our inbox.