Alternatives to Firefox Relay
Mozilla's email masks
Firefox Relay ranks #4 of 10 in Email alias services, with an Alt Score of 75. It is licensed under MPL-2.0 and freemium. 7 of 9 checklist rows are verified against a public source.
People who want to sign up for websites, newsletters, or apps without exposing their real email or phone number, and who want to cut down on spam and tracker exposure.
Relay generates random email masks (and phone masks on paid plans) that forward messages to your real inbox without revealing your actual address. The free plan includes up to 5 email masks, a browser extension, and tracker removal in forwarded emails. Premium adds unlimited masks, a custom @yourdomain relay address for creating masks on the fly, phone number masking, and the ability to reply anonymously through a mask.
You generate a mask (a random email address or, on paid tiers, a phone number) and give it out instead of your real contact info; anything sent to the mask is forwarded to your real inbox/phone, and you can disable or delete individual masks anytime from your dashboard to stop unwanted senders.
Why people leave Firefox Relay
Dashed reasons are sourced facts; the rest are opinions. Vendors can dispute.
Sign in to add a reason — new reasons go through moderation before appearing.
Ranked alternatives
Ordered by Alt Score. Click any score to see the breakdown.
Forward Email is a fully open-source email forwarding provider that lets users send and receive mail as unlimited aliases on their own custom domains, with IMAP/POP3/SMTP support.
33mail is a long-running (since 2011) email aliasing service that generates unlimited disposable forwarding addresses to protect a user's real inbox, with anonymous reply and a Chrome extension.
AliasVault is an open-source, end-to-end encrypted password manager with a built-in email alias generator and mail server, positioned explicitly as an open-source alternative to SimpleLogin.
ImprovMX is a widely used email forwarding service that turns a custom domain into unlimited catch-all-capable aliases forwarding to any inbox, with a generous free tier and paid plans adding SMTP sen.
Burner Mail is a browser-extension-driven email alias service that auto-fills disposable forwarding addresses on signup forms, supports replying from an alias through the user's normal inbox, and offe.
Feature comparison
How Firefox Relay compares with its alternatives, feature by feature.
| Email alias services checklist | Firefox Relay | SimpleLogin | addy.io | Forward Email | 33mail | AliasVault |
|---|---|---|---|---|---|---|
| Pricing model | ||||||
| Starts at | ||||||
| License | ||||||
| Platforms | ||||||
| Unlimited aliases (paid) | ||||||
| Custom domains | ||||||
| Reply from alias | ||||||
| Browser extension | ||||||
| Self-hostable | ||||||
| Open source | ||||||
| PGP encryption | ||||||
| Free tier limits | ||||||
| Catch-all support |
Every fact and feature listed for Firefox Relay is verified against its own pages. Each alternative is sourced on its own page.
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License MPL-2.0 verified 2026-07-08
Mozilla Public License Version 2.0
https://raw.githubusercontent.com/mozilla/fx-private-relay/main/LICENSE -
Pricing model Freemium verified 2026-07-08
If you have more than 5 masks in total, you will not be able to create any more. You'll also lose the ability to reply to forwarded messages. You can resubscribe to Relay Premium and regain access
https://relay.firefox.com/faq/ -
Status active verified 2026-07-08
Actively developed Mozilla project.
License: MPL 2.0
https://raw.githubusercontent.com/mozilla/fx-private-relay/main/README.md -
Unlimited aliases (paid) Yes verified 2026-07-08
Free capped at 5 masks; Relay Premium removes the cap (unlimited).
If you have more than 5 masks in total, you will not be able to create any more. … You can resubscribe to Relay Premium and regain access to these features.
https://relay.firefox.com/faq/ -
Custom domains Yes verified 2026-07-08
Custom email subdomains, available to Relay Premium subscribers, allow you to generate easier-to-remember email masks.
https://relay.firefox.com/faq/ -
Reply from alias Yes verified 2026-07-08
Relay Premium users can reply to a forwarded email within 3 months of receiving the email.
https://relay.firefox.com/faq/ -
Browser extension Yes verified 2026-07-08
Firefox Relay lets you generate email aliases that forward to your real inbox.
https://addons.mozilla.org/en-US/firefox/addon/private-relay/ -
Self-hostable Partial verified 2026-07-08
Code is public and runnable locally, but Mozilla offers no supported self-hosting path.
Running the add-on locally allows it to communicate with your local server (`127.0.0.1:8000`) instead of the production server (`relay.firefox.com`).
https://raw.githubusercontent.com/mozilla/fx-private-relay/main/README.md -
Open source Yes verified 2026-07-08
Mozilla Public License Version 2.0
https://raw.githubusercontent.com/mozilla/fx-private-relay/main/LICENSE -
Free tier limits Yes verified 2026-07-08
If you have more than 5 masks in total, you will not be able to create any more.
https://relay.firefox.com/faq/
FAQ
Yes. SimpleLogin, addy.io and Forward Email have a free tier or are fully free. Free-tier limits in the comparison table are verified and dated.
SimpleLogin, addy.io and Forward Email — every license claim links its source.