Aliases for Fastmail

Create Fastmail Masked Email aliases with a custom prefix and fill them into signup forms. Not affiliated with Fastmail.

Sign up for things without handing out your real email address. Aliases for Fastmail creates Fastmail Masked Email addresses right inside signup forms. Click into an email field, click the @ bubble, and you get an address like netflix.k3j9x@fastmail.com, already filled in and copied to your clipboard. Mail to it lands in your Fastmail inbox, and you can turn it off any time. Features • Custom prefixes: the prefix defaults to the site's name (netflix, github, …) so you can tell your aliases apart at a glance. Edit it before creating. • Fills the form for you, including "confirm email" fields, and works with React, Vue and web-component forms. • Reuse: on a site where you already have an alias, it offers that one instead of making a new one. • Right-click any field and choose "Create Fastmail alias here". • Toolbar popup: create an alias for the current site, with this site's aliases listed first and everything else one tap away. Copy, turn off and on, or delete with a 5-second undo. Click an alias to see the full address, the site it was made for and the date. • Light and dark: the popup follows your browser, and the @ button matches the site you're on. • Plays well with password managers: the @ button steps aside for Bitwarden, 1Password, LastPass, Proton Pass and Dashlane icons, and your password manager saves the login with the alias when you submit. • Accessible: keyboard-friendly controls, strong text contrast in both themes, and support for reduced transparency. Privacy • Your Fastmail API token stays in your browser and is only ever sent to api.fastmail.com. • No analytics, no tracking, no servers of our own. • Open source under the Apache 2.0 license. Setup You need a Fastmail account. In Fastmail, go to Settings → Privacy & Security → Integrations → API tokens, create a token with the Masked Email scope only, and paste it into the extension's settings page. This is an independent project. It is not made by, affiliated with or endorsed by Fastmail. Fastmail is a trademark of its owner.