Reliable email delivery,built for developersand teams
Send transactional and broadcast email across unlimited domains — with an API, SMTP relay, and deliverability tooling on the edge.
Transactional Email
Fire password resets, receipts, and alerts through a single fast API.
Broadcasts
Design and send newsletters and campaigns to your whole audience.
Deliverability
SPF, DKIM, DMARC, and suppression lists keep you out of the spam folder.
Everything you need to send email
One platform for transactional email, broadcasts, and the infrastructure that gets them delivered.
Your first email in minutes
A single HTTP request is all it takes. Authenticate your domain, grab an API key, and send.
await fetch("https://api.markrelay.com/v1/emails", {
method: "POST",
headers: {
Authorization: `Bearer ${MARKRELAY_API_KEY}`,
"Content-Type": "application/json",
},
body: JSON.stringify({
from: "MarkRelay <hello@yourdomain.com>",
to: "user@example.com",
subject: "Welcome aboard 🎉",
html: "<p>Thanks for signing up!</p>",
}),
});Prefer SMTP? Point your existing mailer at our relay and keep your current code.
Who Is It For?
Anyone who needs email that just works
Developers
Drop email into any app with a clean API, SMTP relay, and webhooks — no infrastructure to babysit.
Product Teams
Ship reliable transactional email — verifications, receipts, and notifications that always arrive.
Marketers
Build, send, and measure broadcasts to your whole audience from one simple console.
Agencies
Manage sending for unlimited client domains, each with its own identity and analytics.
AI Agents
Give automated workflows a programmable mailbox to send and react to email events.
Startups
Start free, then scale to millions of emails on transparent, pay-as-you-grow pricing.
Ready to ship email that lands?
Join MarkRelay today and send your first email in minutes.
Why choose MarkRelay?
The deliverability of a dedicated platform, the simplicity of a single API.