The best Firefox Relay alternative
Firefox Relay is Mozilla's email-masking service with strong brand trust and an open-source codebase. But it lacks server-side encryption, real custom domains, sender-risk monitoring, and the exposure intelligence that EmailAlias is built around.
Why users switch from Firefox Relay to EmailAlias
Real Custom Domains, Not Just Subdomains
Firefox Relay Premium gives you a custom subdomain on @mozmail.com — e.g. yourname@mozmail.com. EmailAlias Premium lets you add up to 5 fully custom domains with full SPF, DKIM, and DMARC verification, so your aliases live on a domain you actually own.
Suspicious Sender Intelligence
Firefox Relay forwards mail without analysing the sender. EmailAlias scores every incoming sender on risky TLDs, typosquatting patterns, and phishing keyword signals — and alerts you the moment a high-risk sender hits one of your aliases.
AES-256 Encrypted Storage
Mozilla doesn't publicly document at-rest encryption for Relay's alias-mapping database. EmailAlias encrypts every alias mapping and metadata record with AES-256, with documented key-management practices on our security page.
Exposure Intelligence Dashboard
EmailAlias gives you per-alias risk scores, an exposure events feed, and a forwarding activity timeline so you can see exactly which services are leaking your address. Firefox Relay shows only basic forward / block counts.
Cross-Browser Extension
Firefox Relay's deepest integration is in Firefox itself (with a Chrome extension as a secondary option). EmailAlias ships first-class extensions for Chrome, Firefox, Edge, and Opera — all from a single codebase, with site-to-alias memory and Manifest V3 throughout.
API Access for Automation
EmailAlias Premium includes a full REST API and an MCP server for Claude Desktop, Cursor, Zed, and other AI assistants — so you can manage aliases from your terminal, scripts, or LLM. Firefox Relay has no public API.
Feature comparison
A fair note about Firefox Relay
Firefox Relay is built and operated by Mozilla, an organisation with a long-standing reputation for user privacy. The service is open source, integrates tightly with Firefox, and offers an optional phone-number masking add-on that EmailAlias does not. If those factors outweigh server-side encryption, real custom domains, and sender-risk monitoring for your use case, Relay is a reasonable choice. EmailAlias optimises for users who want the deeper privacy posture and the visibility into who is sending to which alias.
Pricing side-by-side
Both providers run a free tier and a paid tier. Relay also bundles an optional phone-masking add-on. EmailAlias adds a 7-day trial and bundles exposure analytics into the price.
Free plan
Paid plan
Competitor pricing reflects publicly listed tiers and may change — verify on the provider's site before switching.
How to switch from Firefox Relay in 5 steps
Most users can cut over in under 15 minutes. Relay's @mozmail.com masks aren't portable — you'll be issuing fresh aliases per service.
- 1
Create your EmailAlias account
Sign up at emailalias.io with the same destination inbox you use today. Premium starts with a 7-day free trial — you'll need it active to add real custom domains.
- 2
Inventory your Firefox Relay masks
Open relay.firefox.com → Email masks and list each one with the site it was given to. Relay doesn't ship a bulk export, so you'll typically copy them out manually or use the dashboard's filter view.
- 3
Re-create the aliases on EmailAlias
Mint a fresh alias on @emailalias.io for each service. If you want real custom domains (instead of Relay's @mozmail.com subdomain), add yourdomain.com to EmailAlias, verify DNS (SPF + DKIM + DMARC), and create the aliases there instead.
- 4
Confirm your forwarding destination
Verify your destination inbox in EmailAlias and send a test email to one new alias. Premium supports unlimited verified destinations if you split mail across multiple inboxes.
- 5
Cut over and disable Firefox Relay masks
Update each service's contact email from the @mozmail.com mask to the new EmailAlias alias. Leave Relay forwarding active for 2–4 weeks as a safety net, then disable each mask once your dashboard shows zero inbound traffic.
Frequently asked questions
The questions we get most often from people moving over from Firefox Relay.
Can I move my aliases between providers?
Aliases on a shared provider domain (e.g. @emailalias.io) aren't portable — they live on our domain and stay with us. Aliases on a custom domain (yourdomain.com) are fully portable: you keep the domain, point its MX records at a new provider, re-create the same local-parts on their side, and the addresses keep working — provided the new provider supports custom local-parts (most do; some only issue random codes). Custom domains are a Premium feature on EmailAlias, but for anyone who plans to use aliases long-term, it's vendor-independence insurance worth having.
What does Premium include?
Unlimited aliases, up to 5 custom domains, unlimited verified forwarding inboxes (so each alias can route to the right mailbox), send & reply from any alias, real-time leak detection with exposure analytics, and priority processing — all for $4/month or $35/year (save 27%).
What happens if a service I signed up for gets breached?
Because each service has its own unique alias, you'll know exactly which service leaked your data — when spam or phishing hits that alias, the source is obvious. Our exposure intelligence engine also flags suspicious senders in real time. Disable the affected alias and your real email stays safe.
Is EmailAlias open source like Firefox Relay?
No — EmailAlias is closed-source, hosted SaaS. Firefox Relay is open-source and operated by Mozilla, which carries strong brand trust around user privacy. EmailAlias optimizes for a different trade-off: a fully managed service with real custom domains, sender-risk scoring, exposure intelligence, and a curated dashboard out of the box. If the open-source and Mozilla-trust factors are your priority, stay on Relay; if you want real custom domains and leak detection bundled in, switch.
What's the difference between a real custom domain and Relay's @mozmail.com subdomain?
Firefox Relay Premium gives you a subdomain — e.g. yourname@mozmail.com — where Mozilla still owns the parent domain. EmailAlias Premium lets you bring a domain you actually own (yourdomain.com) and create aliases on it with full SPF, DKIM, and DMARC verification. The practical difference: if you ever leave the provider, real custom domains stay with you (re-point MX, keep working). Subdomain aliases die when you leave Mozilla's service.
Does EmailAlias offer phone-number masking like Relay's Email + Phone bundle?
No. Firefox Relay's standout feature beyond email masking is its phone-number masking add-on (US/Canada). EmailAlias is email-only — we don't issue masked phone numbers. If phone masking is a hard requirement, you'd need to keep Relay or pair EmailAlias with a separate number-masking service.
Can I migrate my existing Firefox Relay masks?
Masks on Mozilla's shared domain (e.g. @mozmail.com) can't be ported — those addresses belong to Mozilla. You'll need to issue fresh @emailalias.io aliases (or aliases on your own custom domain) and update each service's contact email one at a time. If you used a Relay custom subdomain, the same applies: the subdomain is hosted by Mozilla, so the cutover is per-service.
More questions? See the full FAQ.
More than masking — full exposure intelligence
Real custom domains, sender-risk scoring, encrypted forwarding, and a cross-browser extension — all in one place. Try EmailAlias free for 7 days.