Skip to main content
When Slashy is your default mail app, every mailto: link, every “Email me” button on a website, and every contact card’s email action opens a Slashy compose window. The macOS Mail app stops intercepting those clicks. This works on macOS today; iPhone and iPad are not supported yet (see iOS).

​
macOS

The Slashy desktop app registers as a mail handler on first launch. Telling macOS to actually use it takes two settings, because macOS treats browser-initiated mailto: links and system-initiated ones separately.
1

Open System Settings → Default web browser

Set your preferred browser. Any mailto: link clicked inside that browser will route through it before hitting your default mail app.
2

Open the macOS Mail app once

Launch Mail.app from Spotlight or Applications. Don’t sign in. Go to Mail → Settings → General → Default email reader, and choose Slashy from the dropdown.
3

Quit Mail.app

You only opened it to expose the setting. Quit it and macOS will route mail actions to Slashy from now on.
Apple has put the default mail app picker inside Mail.app’s preferences for years. It looks odd but that’s where it lives. You don’t need a Mail.app account configured.

​
iOS

Slashy can’t be set as the default mail app on iPhone or iPad yet, so it does not appear under Settings → Apps → Default Apps → Email (on iOS 18.1 and earlier, Settings → Mail → Default Mail App). Reinstalling, opening the app, or signing in again won’t change that. iOS only lists apps that Apple has approved as mail clients. Slashy’s iOS app already opens mailto: links in compose, and we’re waiting on Apple’s approval to appear in that list.

​
What changes after you set it

  • Clicking a mailto: link on any website opens Slashy compose with the address pre-filled.
  • “Email me” buttons in Calendar invites, Contacts, and other apps open Slashy.
  • Right-clicking an address on macOS and choosing New Email opens Slashy.
  • Calendar event organizer email actions open Slashy.
The actual sending still goes through whichever inbox you’ve connected to Slashy. Slashy is the editor; Gmail is still the wire.

​
Reverting

To go back to Apple Mail or another client, repeat the steps above and pick the other app in the same dropdown. The change applies immediately; no restart needed.
That’s expected for now. Setting Slashy as the default mail app on iPhone or iPad isn’t available yet because it is waiting on Apple’s approval. There is nothing to fix on your device.

Desktop app

Install Slashy on Mac or Windows.

Slashy on mobile

Set up the iOS app.

Composing email

Write and send from Slashy.

Why a primary email

Pick the inbox compose uses by default.

Multiple accounts

Send from any connected inbox.