Comparison

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

Feature
EmailAlias
Firefox Relay
Email Alias Forwarding
AES-256 Encryption at Rest
Zero-Knowledge Architecture
Real Custom Domains
Suspicious Sender Detection
Exposure Intelligence Dashboard
Real-Time Sender Risk Alerts
Send & Reply from Alias
SPF / DKIM / DMARC
Spam Blocking
Catch-All Aliases
API Access (Premium)
Cross-Browser Extension (Chrome, Firefox, Edge, Opera)
Phone Number Masking
Open Source
7-Day Free Trial

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.

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.

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