Firefox Relay alternatives are email alias services that forward mail to a real inbox without exposing the real address in signups. Firefox Relay gives 5 free masks, SimpleLogin gives 10 free aliases with replies, and addy.io gives unlimited standard aliases at 10 MB a month. DuckDuckGo Email Protection is reported as free with unlimited private @duck.com addresses. Its provider page could not be fetched. Fastmail is a paid mailbox service with alias features, not a free forwarding layer. This article compares limits, replies, domain support and price from provider pages fetched on 30 October 2026.
An email alias is a forwarding address tied to one site or purpose, with mail routed to a destination inbox the user already owns. The mechanism contains a leak because one address is linked to one sender, so a breach of that sender exposes that alias and not the address used everywhere else. A separate alias for every website is the pattern in the guide to a different email for every website. The pattern works only when the alias can be blocked or deleted. The services compared here cover the same job with different limits.
Comparison of limits, replies and domains
| Service | Free alias limit | Replies from an alias | Own domain |
|---|---|---|---|
| Firefox Relay | 5 masks | Premium only | No, Premium gives a Relay subdomain |
| SimpleLogin | 10 aliases | Yes, on the free plan | Premium only, unlimited |
| addy.io | Unlimited standard aliases, 10 active shared domain aliases | Paid plans only | Lite 1, Pro 20 |
| DuckDuckGo Email Protection | Reported as unlimited private @duck.com addresses | Reported as yes, with limits | No |
| Fastmail | No free plan; free trial mentioned on the pricing page | Not stated on the pricing page | Yes, on paid plans |
| AliasFleet | 10 active aliases | Yes, two-way routing on the free tier | Pro up to 3, Business up to 10 |
Relay gives 5 free masks with replies on Premium only, SimpleLogin gives 10 free aliases with replies on the free plan, and addy.io gives unlimited standard aliases with replies on paid plans only and 10 MB of monthly bandwidth on the free plan. DuckDuckGo is reported as giving unlimited private addresses with replies and no custom domain support, while Fastmail is a paid mailbox service with alias features built in. Domain control also differs across the services. An address on a provider subdomain stays tied to that provider, while an address on a domain the user owns can move between providers without changing every address.
Firefox Relay
Firefox Relay is Mozilla's email masking service. Its free plan, as listed on its homepage on 30 October 2026, gives 5 email masks, a browser extension and removal of email trackers from forwarded mail. Relay Premium gives unlimited masks, a unique Relay email domain, anonymous replies and blocking of promotional mail. Premium lets the user create masks on the go under a subdomain of Mozilla's domain, for example shop@yourdomain.mozmail.com, so the addresses stay tied to Mozilla's domain.
The free mask count conflicts across sources: a June 2026 report described a rise from 5 to 50 free masks, and Mozilla terms dated March 2026 describe up to 50 random masks on the free service. The Relay homepage fetched on 30 October 2026 states 5 free masks in its table and feature text, and the homepage figure is used here. The homepage showed no Premium price. Premium buttons were marked as a waitlist. Secondary comparisons report $0.99 per month, but that figure was not verified on the provider page, so it is not stated as fact here.
The Relay homepage states that masks are not recommended where identity must be verified or for very important mail. It names a bank as an example. That guidance matches the banking position in this article, under which a bank receives a permanent real dedicated address used only for financial accounts, while aliases serve every other purpose.
SimpleLogin
SimpleLogin is an open source alias service linked to Proton, and its pricing page lists the plans below. Its free plan costs $0 and gives 10 aliases, unlimited bandwidth, replies from an alias, 1 mailbox, browser extensions and mobile apps. The limit is the count, since 10 aliases cover a small set of important accounts. Premium costs $36 per year or $4 billed monthly. It gives unlimited aliases, unlimited custom domains, unlimited mailboxes, a catch-all domain, 5 subdomains, 50 directories or usernames and the ability to start a new email from an alias through a reverse alias.
SimpleLogin states that aliases created on a paid plan keep working after a subscription ends, although no new aliases can be created above the free limit. The rule applies after a subscription ends. Existing addresses keep receiving and sending mail after a subscription ends. SimpleLogin free includes replies and allows 10 aliases. Premium allows unlimited aliases and unlimited custom domains.
addy.io
addy.io differs from SimpleLogin on the free plan, because count is open and bandwidth and replies are capped. The free plan gives unlimited standard aliases, 10 active shared domain aliases, 1 recipient, 2 alias domains and 10 MB of monthly bandwidth. Messages with attachments use monthly bandwidth, and the single recipient means all aliases forward to one inbox. Lite costs $1 per month billed yearly and gives 1 custom domain, 50 replies or sends from aliases per day and 100 MB of monthly bandwidth. Pro costs $3 per month billed yearly or $4 billed monthly, with unlimited shared domain aliases, 200 replies or sends per day, 20 custom domains, 30 recipients and unlimited bandwidth.
SimpleLogin free allows 10 aliases and includes replies from an alias. addy.io free allows unlimited standard aliases, 10 MB of monthly bandwidth and 1 recipient, with replies on paid plans only.
DuckDuckGo Email Protection
DuckDuckGo Email Protection is reported as a free forwarding service, not a mailbox. Secondary comparisons dated October 2026 report that it gives a personal @duck.com address and unlimited private @duck.com addresses, strips hidden trackers from forwarded mail, and forwards the cleaned message to an existing inbox. The same comparisons report replies from the address that received a message, no paid tier and no custom domain support, so all addresses stay on duck.com. Replies are reported with limits. The Paul O'Brien DuckDuckGo Email Protection review notes that DuckDuckGo's help page says replies are not supported if the forwarding address is on a unique domain without an SPF record.
That description is marked as reported rather than provider verified, because the provider page fetch failed on 30 October 2026 with a network error and a fresh fetch on the same date failed again. A failed fetch proves nothing about the service. The DuckDuckGo page at DuckDuckGo Email Protection could not be verified. The reported shape is unlimited private addresses without a domain. Secondary comparisons report no paid tier.
Fastmail
Fastmail is a different kind of alternative, because it is a paid mailbox service with alias features, not a forwarding layer on top of an existing inbox. Its Individual plan costs $5 per month billed yearly, which is $60 per year, or $6 monthly, and its pricing page lists Masked Email, use of a domain the user owns and many custom addresses on one account. Business plans start at $3 per user per month billed yearly. Business Standard and Professional cost $5 and $9 per user per month billed yearly, with prices stated as tax exclusive.
Masked Email is Fastmail's version of a private forwarding address, tied to the Fastmail mailbox, and the pricing page fetched for this article did not state a numeric limit for masked addresses or a reply mechanism for them, so no number or reply claim is made here. The pricing page lists Masked Email among the features on all plans. Fastmail provides a mailbox, while a forwarding service adds aliases on top of an existing inbox. The Fastmail pricing page is the source for the plan details in this section.
AliasFleet managed alias service
AliasFleet is a managed alias service. Its free tier gives 10 active aliases, 1 verified destination inbox, 3 managed subdomains, 100 MB of monthly forwarding bandwidth and two-way reply routing, according to its pricing FAQ. Pro supports up to 3 custom domains and Business supports up to 10 custom domains, with automated DNS diagnostics for MX, SPF and DKIM. Pro costs $12 per month normally, with a Founders Club rate of $7. Business costs $29 per month normally, with a Founders Club rate of $17. The model is one alias per site, with each alias managed as a persistent identity that can be paused or killed when it leaks.
AliasFleet does not change the banking rule in this article, stated in the guide to a separate email for banking, because a bank gets a permanent real dedicated address used only for financial accounts, never a masked or relay alias, since recovery, statements and fraud alerts depend on that address. AliasFleet does not provide a mailbox in the Fastmail sense. It forwards to a destination inbox the user already owns, and the AliasFleet pricing page at AliasFleet pricing is the source for the free tier and domain counts in this section.
Subscription changes and domain control
SimpleLogin states that existing aliases keep working after a subscription ends, while addy.io states that paid features such as custom domains are deactivated after a downgrade and are switched back on if the user resubscribes within 90 days. Relay masks stay tied to Mozilla's domain. DuckDuckGo addresses are reported as staying on duck.com, and only a domain the user owns can move between providers without changing every address.
Readers who want side by side comparisons can use the AliasFleet compare index. Prices and limits change; provider pages state the current figures.
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