Programmable email · Java

Programmable email in Java

Drive email entirely from Java: send with one call, receive every inbound message as parsed JSON on a webhook, and give any app or AI agent its own inbox on a domain you control — with no mail server to run.

Start free Quickstart

Install

Add the Java library:

install · Java

<!-- pom.xml -->
<dependency>
  <groupId>dev.mailkite</groupId>
  <artifactId>mailkite</artifactId>
  <version>0.1.0</version>
</dependency>

Send an email

One endpoint, one API key — over your own authenticated domain. Send API reference →

send · Java

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>"
));

Receive email as a webhook

Point your domain's MX at MailKite and every message arrives as parsed JSON — verify the signature, then handle it. No IMAP, no mail server.

receive · Java

// Spring Boot
@PostMapping(value = "/hooks/mailkite", produces = "application/json")
public ResponseEntity<String> mailkite(
        @RequestHeader("x-mailkite-signature") String signature,
        @RequestBody byte[] rawBody) throws Exception {
    MailKite mk = new MailKite(""); // no API key needed to verify
    String body = new String(rawBody, StandardCharsets.UTF_8);
    if (!mk.verifyWebhook(signature, body, System.getenv("MAILKITE_WEBHOOK_SECRET"))) {
        return ResponseEntity.status(401).build();
    }
    // ...handle the event
    return ResponseEntity.ok(mk.replyOk()); // {"status":"ok"}
}

Go deeper: Email to webhook: the complete guide, or give an AI agent its own inbox.

Everything programmable email does

Send, receive, and agent inboxes — the same shape in every language. See the full picture →

Unlimited domains ·Unlimited mailboxes ·3,000 emails/mo — 100 emails/day. Pricing →