Send receipts, password resets, and verification emails from your own SPF/DKIM/DMARC-aligned domain with a single REST call — or any of eight SDKs and a CLI. Inbound and outbound share one quota.
Mail sends from your domain with SPF, DKIM, and DMARC aligned, so it authenticates as you and lands where it should.
Sending shares the same account and monthly quota as receiving — no second bill, no separate sending product to provision.
Set inReplyTo with a message-id and MailKite writes the threading headers, so replies to your notifications thread cleanly.
Clean SDKs in eight languages, a CLI, and an MCP server — send from your app, a script, or an agent with the same API.
Add SPF and DKIM records; MailKite checks them and unlocks sending aligned to your domain.
POST from, to, subject, and html/text with your API key — or use an SDK method. That's the whole send.
Watch delivery in the dashboard, and thread replies by referencing the message-id on the next send.
One authenticated POST — or one SDK call — sends from your own SPF/DKIM-aligned domain.
Messages → Compose
From hello@myapp.ai
To ada@example.com
Subject Your invoice #1042
Body Thanks! Receipt attached.
Click [ Send ]Email ada@example.com from hello@myapp.ai
with subject "Your invoice #1042" and body "Thanks! Receipt attached."import { MailKite } from "mailkite";
const mk = new MailKite(process.env.MAILKITE_API_KEY);
const { id, status } = await mk.send({
from: "hello@myapp.ai",
to: "ada@example.com",
subject: "Your invoice #1042",
html: "<p>Thanks! Receipt attached.</p>",
});import os
from mailkite import MailKite
mk = MailKite(os.environ["MAILKITE_API_KEY"])
res = mk.send({
"from": "hello@myapp.ai",
"to": "ada@example.com",
"subject": "Your invoice #1042",
"html": "<p>Thanks! Receipt attached.</p>",
})<?php
$mk = new \MailKite\Client(getenv('MAILKITE_API_KEY'));
$res = $mk->send([
'from' => 'hello@myapp.ai',
'to' => 'ada@example.com',
'subject' => 'Your invoice #1042',
'html' => '<p>Thanks! Receipt attached.</p>',
]);MailKite mk = new MailKite(System.getenv("MAILKITE_API_KEY"));
Object res = mk.send(Map.of(
"from", "hello@myapp.ai",
"to", "ada@example.com",
"subject", "Your invoice #1042",
"html", "<p>Thanks! Receipt attached.</p>"
));mk := mailkite.New(os.Getenv("MAILKITE_API_KEY"))
res, err := mk.Send(mailkite.Message{
From: "hello@myapp.ai",
To: "ada@example.com",
Subject: "Your invoice #1042",
HTML: "<p>Thanks! Receipt attached.</p>",
})require "mailkite"
mk = Mailkite::Client.new(ENV["MAILKITE_API_KEY"])
res = mk.send(
"from" => "hello@myapp.ai",
"to" => "ada@example.com",
"subject" => "Your invoice #1042",
"html" => "<p>Thanks! Receipt attached.</p>"
)curl https://api.mailkite.dev/v1/send \
-H "Authorization: Bearer $MAILKITE_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"from": "hello@myapp.ai",
"to": "ada@example.com",
"subject": "Your invoice #1042",
"html": "<p>Thanks! Receipt attached.</p>"
}'Messages → Sent
● queued msg_2Hk9… ada@example.com Your invoice #1042Sent — message msg_2Hk9…, status queued.← 202 Accepted
{ "id": "msg_2Hk9…", "status": "queued" }← 202 Accepted
{ "id": "msg_2Hk9…", "status": "queued" }← 202 Accepted
{ "id": "msg_2Hk9…", "status": "queued" }← 202 Accepted
{ "id": "msg_2Hk9…", "status": "queued" }← 202 Accepted
{ "id": "msg_2Hk9…", "status": "queued" }← 202 Accepted
{ "id": "msg_2Hk9…", "status": "queued" }← 202 Accepted
{ "id": "msg_2Hk9…", "status": "queued" }MailKite targets transactional and inbound-first workloads — receipts, resets, verifications, notifications — sent from your own domain. For very high-volume marketing sending, evaluate against your specific volume and deliverability needs.
A domain with SPF and DKIM records added and verified. Once it passes, you can send to anyone — there's no sandbox or production-access request.
Yes — the same Send API is available over the hosted MCP server and Claude Code plugin, plus the CLI and eight SDKs.
Start free on unlimited domains — no credit card. Or browse the other solutions.