Open mailto links from other sites in Fastmail

When you click a "mailto" email link on another website, it will normally create a new message in your default mail application. To open these links with Fastmail:

1. Log in to your account.
2. Open the Settings → Preferences screen.
3. Click the "Open mailto links from other sites in Fastmail" link. It's near the top, part of the "General" section. If the button is disabled, then your browser does not support this functionality. You might like to upgrade to the latest version of Opera, Firefox or Chrome.
4. Your browser may prompt you to allow Fastmail to open mailto links, normally in a bar at the top of the page. Click the button to allow it.

Now, any mailto link you click should open a new compose window in Fastmail. If you're not logged in at the time, you'll be prompted to log in first, then taken to the compose screen.