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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 and iOS Mail stop intercepting those clicks.

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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.
macOS Mail Settings showing Default email reader set to Slashy
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.

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iOS

1

Open Settings → Mail

On your iPhone or iPad.
2

Tap Default Mail App

iOS lists every installed app that has registered as a mail handler. Slashy appears once the iOS app has been installed and opened at least once.
3

Select Slashy

From this point on, tapping an email address in Contacts, Calendar, Safari, or any other app opens Slashy’s compose screen pre-filled with the recipient.
iOS Default Mail App picker with Slashy selected

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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.
Slashy compose window opened from a mailto link with recipient pre-filled

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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.
Install the Slashy iOS app, open it once, and sign in. iOS only registers a mail handler after first launch. Once that’s done, the picker shows Slashy.

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.