Separate accounts
Switch between Resend accounts, each with its own mail and settings.
FREE · OPEN SOURCE
Email from your domain.
OnlySend is a free app for writing emails and sending them through Resend. Use your own domain and keep downloaded copies on your computer.
The app is free. You need your own domain and a Resend account; their costs and limits apply separately.
For Linux, Windows, and macOS
A look inside OnlySend
WHAT IT DOES TODAY
Write, send, and keep a local copy.
Resend handles sending and optional receiving. OnlySend gives you a desktop interface and keeps downloaded messages available offline.
Built with Rust and Tauri. SQLite stores the local archive so you can read downloaded messages offline.
Your domain and sender addresses
Use a domain you already own. Manage domains, sender addresses, and DNS configuration from the app.
An editor for everyday email
Write rich-text emails with attachments, CC, BCC, and Reply-To, instead of composing API requests.
An archive on your computer
Downloaded messages stay in your local archive, even if they disappear from Resend’s lists. Receiving is optional.
WHY THIS PROJECT EXISTS
Sometimes you just need to send email from your domain.
Using your domain for a few emails does not always justify a whole office suite. OnlySend connects a Resend account to a desktop editor. The app is free and open source.
OnlySend + Resend
OnlySend does not charge for the app or per sender address. Resend handles email delivery under its own plans and limits, including domain limits. You provide a registered domain.
Google Workspace Business / Microsoft 365 Business
These are paid subscriptions per user, with hosted email and productivity tools. They make sense when you also need the suite and its team features.
OnlySend focuses on desktop email through Resend. It does not replace a collaboration suite or include domain registration.
Provider plans and limits:ResendGoogle WorkspaceMicrosoft 365
SETUP
You need a domain and a Resend account.
Receiving changes your mail routing. New MX records can redirect existing mail; review the DNS instructions before making changes.
- 1
Connect to Resend
Install OnlySend and connect your Resend account with OAuth or an API key.
- 2
Set up your sender
Follow the setup wizard to choose your domains and sender addresses. Sending needs a verified domain.
- 3
Write and send
Compose your message from your desktop. Enable receiving only if you want an inbox.
Costs, storage, and a few limits.
Is OnlySend really free?
Yes. OnlySend is free to download and use, with its source code available under GPL-2.0-only. Your domain registration and Resend service are separate. Resend offers a free plan with limits and paid plans for other needs.
Does all my email stay off servers?
No. Resend processes sending and receiving on its servers, and recipients’ providers handle their copies too. OnlySend stores its downloaded archive on your computer. It is not a fully local email delivery system.
What do I need to use OnlySend?
A Resend account and access to your domain’s DNS settings. Your domain must be verified to send email. Resend’s own pricing and service limits apply.
Do I need to run a mail server?
No separate OnlySend mail server is required. OnlySend uses Resend for sending and receiving. Receiving is optional.
What is stored on my computer?
Downloaded messages stay locally, even if they disappear from Resend’s lists. Disconnecting an account does not erase its local archive. Local storage is not encrypted. Offline copies include message bodies and attachment metadata, but not attachment files or remote images.
Which download should I choose?
Linux builds are available as .deb and .AppImage, Windows as .exe, and macOS as .dmg for Intel and Apple Silicon. macOS builds are not notarized and may need approval in Privacy & Security. Windows may show a SmartScreen warning.
A free, open-source project.
Downloads, source code, and issues are on GitHub.
Download OnlySendGPL-2.0-only · Built with Rust + Tauri