Comparison

MailFlusher vs Firefox Relay

Firefox Relay is a simple alias service from Mozilla. MailFlusher is a fuller-featured service hosted in Sweden. Here's how they actually compare.

Pick MailFlusher if…

  • You want your data under EU law rather than US law.
  • You need features like custom domains, filtering rules, GPG encryption, or a real API.
  • You want predictable reply support without per-thread reply limits.
  • You use a browser other than Firefox.

Pick Firefox Relay if…

  • You're deep in the Firefox / Mozilla ecosystem and want tight browser integration.
  • You only need 5 throwaway aliases and don't care about reply support or rules.
  • You're fine with US-hosted infrastructure and Mozilla's privacy posture.
  • You want the cheapest possible upgrade path ($0.99/mo).

Side-by-side comparison

Current as of April 2026. Firefox Relay's terms and limits change periodically — double-check their site.

MailFlusher Firefox Relay
Free plan aliases 10 5
Paid entry tier €1/month $0.99/month (annual)
Unlimited aliases Pro — €5/month Premium ($0.99/mo)
Reply from alias Standard & Pro, unlimited Premium only
Send email from alias Yes (Standard & Pro) No
Custom domains Pro Subdomain only (Premium)
GPG / PGP encryption Yes No
Filtering rules Yes (Standard & Pro) No
Multiple recipients / forwarding Yes No
Developer API Full REST API No public API
Browser integration Bitwarden / 1Password — own extensions coming soon Native Firefox extension
Server location Sweden (EU) United States
Subject to CLOUD Act No Yes
Open source Not currently Yes (server)
Burner / auto-expiring aliases Yes (time & email-count limits) No
Leak attribution / data-sale detection Yes No
Tracker / pixel stripping Pixels + link-proxy (opt-in) No
Ghost Inbox (E2E encrypted storage) Yes (Pro) No
Outbound webhooks Yes (Standard+) No
One-click importer from competitors Yes No

Where Firefox Relay is stronger

Price. Premium is $0.99/month when billed annually — the cheapest unlimited-alias plan on the market.

Firefox integration. If you use Firefox, the extension surfaces Relay buttons in email fields on sign-up forms. That's genuinely convenient.

Mozilla brand. Mozilla has a trusted privacy reputation and the service is lightweight and simple. If you just need a handful of aliases, it does the job.

Where MailFlusher is stronger

EU hosting vs US hosting. Firefox Relay runs on Mozilla's US infrastructure. That means CLOUD Act reach, FISA §702, and US subpoena rules apply. We run from Sweden, under EU GDPR — a fundamentally different legal posture.

Actual feature set. Firefox Relay is deliberately minimal — no rules, no GPG, no multi-recipient forwarding, no custom domains (only a subdomain), no public API, send-from-alias not supported. If any of those matter to you, Relay simply can't do them.

Reply support without limits. Relay replies are a Premium feature and historically have had per-thread caps. We don't cap replies.

Works outside Firefox. Our API works with Bitwarden, 1Password, and any HTTP client, and dedicated Chrome and Firefox extensions plus a mobile app are in development. You're not tied to one browser.

Privacy features Relay doesn't offer. Burner aliases that auto-expire by time or email count; leak attribution that flags when an unexpected sender shows up on an alias that was only ever given to one brand; optional pixel and link-proxy tracker stripping. If you care about email privacy beyond "my real address is hidden", these matter.

Try MailFlusher free — 10 aliases, no card required

If you just need 5 aliases and nothing fancy, Firefox Relay is fine. If you want real email privacy tools and EU hosting, start here.

Get started for free