Multiple local SMTP servers
Create separate server profiles, ports, credentials, and inboxes for different apps or test suites.
Open Mail Catcher
Local SMTP mail catcher for macOS. Catch, inspect, and debug emails without sending them.
- Host
- 127.0.0.1
- Port
- 1025
- Secure
- false
- Auth
- optional
SMTP Server Running
Welcome email
PreviewHeadersSourceAttachments
Hello from local dev
This message was captured locally before it could leave your machine.
Point your app at localhost.
Open Mail Catcher listens on a local SMTP port, receives the full MIME message, stores it in SQLite, and updates the inbox immediately.
import nodemailer from "nodemailer";
const transport = nodemailer.createTransport({
host: "127.0.0.1",
port: 1025,
secure: false,
auth: undefined
});
await transport.sendMail({
from: "[email protected]",
to: "[email protected]",
subject: "Test email",
html: "<h1>Hello</h1><p>This was caught locally.</p>",
text: "Hello. This was caught locally."
});Everything you need to inspect development email.
Designed around fast local feedback, clean message inspection, and safe defaults.
Email-client inspection
Review HTML preview, text body, headers, source, recipients, read state, stars, and attachments.
Attachments included
Captured MIME attachments are stored locally with filename, type, size, checksum, and save actions.
Built for local development
Messages stay on your machine. Open Mail Catcher does not relay mail, sync cloud data, or run telemetry.
Documentation that starts with the SMTP details.
The docs cover first-run setup, framework examples, multiple server profiles, local SMTP AUTH, attachments, and common port conflicts.
Open documentationQuick start
Configure your local app with the default SMTP server.
Host127.0.0.1Port1025Securitynone
Local-only by design.
No relay. No cloud. No telemetry. The app exists for local development and testing, not production email delivery.
- SMTP binds to 127.0.0.1 by default.
- Captured email is stored locally.
- HTML preview is sandboxed.
- External images are blocked by default.
Download Open Mail Catcher for macOS.
Grab the latest development build and start catching local email at 127.0.0.1:1025.