Temp Mail vs Email Aliases: SimpleLogin, Firefox Relay, and addy.io Compared

Key Takeaways

An alias forwards mail to you for the long haul; temp mail catches a code and disappears — pick by how long you need it.

Temp mail vs email aliases is a lifespan decision: an alias keeps receiving and can reply over time, while temp mail is a receive-only inbox for a one-off code. This article compares receive-only temp mail with forwarding alias services as a category, using SimpleLogin, Firefox Relay, and addy.io as examples.

• Email aliases forward to your real inbox and can reply, so they suit accounts you keep long-term while hiding your true address.
• Temp mail, like Tmailor, is receive-only and disposable, so it suits one-off signups, OTP codes, and content gates you will never revisit.
• Free tiers vary widely: SimpleLogin includes replies free, addy.io's free plan is capped at 10 MB of monthly bandwidth, and Firefox Relay Free gives five masks. Temp mail needs no account at all.
• If a site must reach you later — order updates or a password reset you rely on — use an alias; if you need a code once, use temp mail.
• Tmailor adds an Access Token so you can reopen the same temp address later, but it only bridges the address-reuse gap, not forwarding or replying.
• Neither hides you from the service you sign up with, and both can be blocked by sites that screen masked or disposable domains.

Temp Mail vs Email Aliases: The Short Answer

Choose by the lifespan of the relationship, not the brand.

Choose an email alias when you want a masked address that forwards to your real inbox and can reply for months or years — a store account or a service that emails you back. Choose temp mail when you need a throwaway inbox to catch a verification code once and never return. Aliases are for continuity; temp mail is for disposal. Put another way, email alias vs. temp mail and alias forwarding vs. temp mail both come down to continuity vs. disposal.

The decision trigger is one question: Will the service need to reach me again? If yes, a forwarding alias keeps that channel open. If no, a disposable inbox is faster and leaves no forwarding rule or alias to manage. When you want disposability but might come back once, reuse the same temp address. An Access Token sits between the two, though it only reopens the address — it does not forward mail.

How Email Aliases Work (SimpleLogin, Firefox Relay, addy.io)

An alias is a forwarding address that hides your real one while keeping mail flowing to you.

An email alias is a forwarding address that receives mail and relays it to your real inbox, so the sender never sees your true address. Tier details vary: SimpleLogin Free includes replies; Firefox Relay Premium adds replies and a mozmail.com Relay subdomain; addy.io paid tiers add bandwidth, custom domains, and reply or send. Aliases persist with the account.

SimpleLogin, a Proton product, gives a free plan with 10 aliases, unlimited bandwidth, one mailbox, and — notably — replies from the alias included at no cost. Its Premium tier adds unlimited aliases, custom domains, and the ability to initiate a brand-new email to a new contact via a reverse alias. That makes the free-versus-paid line about volume and outbound, not about basic replies.

Firefox Relay, from Mozilla, offers 5 free email masks. Relay Premium adds unlimited masks, a Relay subdomain under mozmail.com, and anonymous replies — Relay notes replies work within three months of receiving the forwarded email. Relay is reply-oriented rather than a full outbound client, and its phone-masking feature sits in a separate "Email & phone" plan whose regional availability should be checked at signup.

addy.io offers a free plan with unlimited standard aliases, 10 active shared-domain aliases, one recipient, and 10 MB of monthly bandwidth — the bandwidth cap is the free tier's real constraint. Paid Lite and Pro tiers raise bandwidth, add custom domains, and enable paid replies and sends. Across all three services, the common thread is this: an account is required, mail forwards to a real inbox, replying or sending is often tier-gated, and the alias lasts as long as the account under each provider's acceptable-use policy.

How Temp Mail Works (and Where Tmailor Sits)

Temp mail is an instant, no-signup inbox that receives — and then forgets.

Temp mail is a disposable inbox you can open without registering, used to receive a verification email or a one-off message, then abandon. Messages auto-delete after a set window — about 24 hours on Tmailor —, and there is no forwarding to a personal inbox. Tmailor adds an Access Token so you can reopen the same address later across web, app, and Telegram.

The defining difference from an alias is simple: temp mail has no forwarding and no reply. Can you reply from a temporary email? No — replying to a message requires an alias or forwarding service, not a disposable inbox. Tmailor is receive-only by design, with 500+ domains, Google MX for inbound delivery, and no attachments. Its Access Token is a private recovery key that reopens the same address, and a lost token cannot be recovered, so it is a convenience for reuse rather than an account you log into.

Tmailor publishes this comparison, and its plan details for the alias services here were checked on July 7, 2026. To go deeper on when a reusable inbox beats a throwaway, see our guide to reusable vs short-life inboxes. New to the terminology altogether? Our primer on disposable, burner, and temp mail untangles the labels.

Full Comparison Table

Nine dimensions that decide alias versus temp mail. Verified against provider pages on July 7, 2026.

On the dimensions that matter — forwarding, replies, longevity, registration, and cost — aliases and temp mail split cleanly. Aliases forward and can reply, tier depending, but need an account; temp mail is instant and free, but receive-only and short-lived. The table maps each service so you can shortlist by the job, not the brand.

When an Email Alias Is the Better Choice

If the account must be able to reach you back, an alias wins.

An email alias is the better choice when a service needs to contact you over time — order confirmations, shipping updates, or password resets you rely on. Because an alias forwards to your real inbox and can be replied to, you stay reachable while hiding your true address. Temp mail's auto-expiry would lose those messages, which is why aliases suit accounts you keep, including anything tied to email alias password resets.

Concrete cases favor an alias: an online store you reorder from, a SaaS subscription you renew, or a community forum you post in every month. In each, you want mail to keep arriving without exposing your primary address. A useful test is whether losing a future message would cost you something — a missed shipping update, a delayed invoice, or a password reset you cannot complete. If the answer is yes, the forwarding and reply that an alias provides are worth the small overhead of managing it. If you are already in Apple's ecosystem, our look at Apple Hide My Email covers that specific relay; for browser-level masking with tracker removal, see DuckDuckGo email protection.

When Temp Mail Is the Better Choice

If you only need a code and never want to hear from them again, temp mail is faster and free.

Temp mail is the better choice for low-stakes, one-time signups: a content gate, a coupon, a free trial you are only evaluating, or a forum you will read once. You get an inbox in seconds with no account, catch the verification code, and let it expire — no alias list to manage and nothing forwarding to your real inbox. Tmailor's token covers the rare case where you might return to the same address.

The appeal is disposability: content gates, coupons, and one-off download forms are exactly the moments you do not want tied to a permanent identity. To match a disposable inbox to a specific task, our guide to the best temp mail by need lays out which option is best for each job.

There is also a speed and hygiene argument. An alias adds a small amount of management — you create a mask, it joins your account list, and it forwards until you disable it. For a signup you know is single-use, that overhead buys nothing. Temp mail skips it entirely: open an inbox, read the code, and walk away with no list to prune and no forwarding rule left running. Over dozens of throwaway signups a year, keeping those out of your alias account also keeps that account tidy, so the two tools reinforce each other rather than compete — aliases for the handful of relationships you keep, temp mail for the long tail you do not.

Limitations Both Share

Masking your address is not the same as being invisible to the service.

Neither an alias nor temp mail makes you anonymous to the service itself — you still hand over whatever the signup form requires. Both approaches also share real constraints worth knowing before you rely on them.

• Sites can block both masked-alias and disposable domains, so a verification code is never guaranteed to arrive — and yes, email aliases can be blocked much like temp mail.
• Aliases centralize risk, because one account gates every mask; temp mail loses messages on expiry.
• Neither is a safe home for anything sensitive you must retrieve later; treat both as privacy layers, not storage.
• For banking, government, or healthcare accounts, use a permanent inbox you fully control. Our overview of whether a temporary email is safe clarifies where the line is drawn.

The Bottom Line

The choice is not between temp mail and aliases in the abstract — it is about how long the relationship lasts. Use SimpleLogin, Firefox Relay, or ady.io when you want a masked address that forwards and replies for the long term; use temp mail when you need a throwaway inbox for a code you will never revisit. When you want disposability but might return, Tmailor's Access Token bridges the address-reuse gap — and when you need an inbox now, you can create a free temp mail in seconds.