RunMyMailer is a lightweight desktop app that spins up your own SMTP sender on 127.0.0.1 — so every app, script, and CMS on your machine can send mail without touching a third‑party gateway.
Runs alongside
No monthly quotas, no API keys to rotate, no third party reading your outgoing mail. Point any app at localhost and go.
A full SMTP endpoint on 127.0.0.1 that any language or framework can talk to — swap one config line and every existing mail call just works.
Unlike a dev-only catcher, RunMyMailer actually relays to real inboxes — using the SMTP credentials you already own.
No cloud dashboard, no third party queue. Your message content never leaves your network until it hits the recipient's server.
Every send shows queued, relayed, and delivered status with the raw SMTP response — no guessing why a message didn't land.
Send PDFs, images, and HTML templates the same way your production system will — test the real thing, not a stand‑in.
Connect the SMTP account you already trust. RunMyMailer relays through it — it never stores or resells your messages.
See in the app the moment a recipient opens a campaign or clicks a link. Entirely opt-in via a tunnel token from tunnel.runmyapi.com, issued by request — sending without one works exactly the same, just without live stats.
No server to rent, no DNS to configure before your first test send.
Download RunMyMailer, open it, and the local SMTP listener starts automatically on your machine.
Update one config value in your app, script, or CMS to the local host and port shown in the app.
RunMyMailer relays the message out and shows you the live delivery status as it happens.
RunMyMailer is built and maintained by one person and free to download and use. If it's saving you time, a small donation helps keep it going — no subscription, no strings attached.
Choose any amount — including €0. Paying is never required to get RunMyMailer.
Yes — RunMyMailer relays through an SMTP account you already have (your provider, your company mail, or a transactional service). It gives that account a local address on your machine; it doesn't replace it.
No. RunMyMailer actually delivers to the real recipient, so it works equally well for local development and for lightweight production sending from a single machine.
RunMyMailer currently ships as a Windows installer, running the local SMTP listener on 127.0.0.1.
Yes. Enter your email during setup and RunMyMailer generates your license key automatically — no payment required. If you find it useful, donations are welcome but never required.
Request a tunnel token at tunnel.runmyapi.com — each token is issued by an admin — then paste it into Tunnel Settings inside the app. Don't need real-time stats? Leave it blank; RunMyMailer sends normally either way.
Free to download and use. Installed and sending within five minutes.
Get RunMyMailer