Why Masked Email Beats Disposable Email for Most People

Quick answer: For most people, masked email is better than disposable email. It hides your real address in the same way, but it forwards to your own inbox, so you keep password resets and can delete the address whenever you like. It is also less likely to be blocked, and you are not relying on an inbox that may be public or expire. Disposable inboxes still suit one-off sign-ups if you have no mailbox with masking. Whichever you use, it is worth checking who runs the service, because they can see your mail.

Every online account asks for the same thing: your email address. For most people that address is also their identity. It is the key to password resets, bank alerts and years of correspondence. Handing it to every online store, forum and free trial is a bit like giving every stranger a copy of your front-door key.

Why your email address is worth protecting

Websites lose customer data to hackers more often than most people realise, and an email address is almost always part of what leaks. You can see which breaches have included your own address on Have I Been Pwned. Once an email address is exposed, it ends up on lists that are bought, sold and shared. The first effect is more spam and phishing, which can be convincing because the sender already knows which services you use.

The second effect is more serious. Attackers take leaked email and password pairs and try them on other sites, a technique known as credential stuffing. If you have reused a password, one breach at a forgotten forum can unlock your main mailbox. From there, "forgot password" links can open your banking, shopping and social accounts. A password manager and unique passwords are the real fix, and the NCSC has practical guidance on choosing strong passwords. Using a different email address for each site adds a second layer: even if an attacker gets your password from a forum breach, they won't know the email address you use to log into your bank.

So people reach for tools that keep their real address out of sight. Some use a disposable inbox that vanishes after a short time. Others use a "masked" address that quietly forwards to their real mailbox. These range from free forwarding utilities like DuckDuckGo Email Protection to a paid mailbox with the feature built in, like Fastmail's Masked Email. Both ideas are sound. What matters more than the idea is who is running the service, because whoever runs it can see every message that passes through.

In an earlier post I looked at QuickInbox.app, a small disposable-email site. This article takes a wider look. It covers how disposable and masked email actually work, why websites increasingly block them, what independent reviewers say about the main options, and why I think a built-in feature from an established provider like Fastmail beats a separate burner app for most people.

Disposable email vs masked email: what's the difference?

The two terms get mixed up constantly, but they work differently.

A disposable (burner) email is a short-lived inbox you open in a browser, use once and abandon. There is usually no account, no password and no link to you. The mail is typically deleted after a short window.

A masked email (or alias) is a real address that forwards to your actual inbox. You create one per website. Fastmail describes the benefit simply: companies cannot link different Masked Email addresses together to track you, and if one starts getting spam you can switch it off and know who leaked it.

The practical difference is this. A disposable inbox is for something you will never need again. A masked address can serve either purpose, because you decide whether to delete it or keep it:

• Finished with the site? Delete or block the masked address. The site can no longer reach you, and your real address was never exposed. Fastmail's Masked Email can be blocked or deleted from your settings.
• Want to keep the account? Leave it in place. Password resets and alerts keep arriving in your normal inbox.

That gives you the throwaway benefit of a disposable address without the dead end. It also helps with three problems: trust, blocking and control.

Benefit 1: Clear legal accountability

Every email privacy tool shares the same underlying limitation: to forward, store, or display your messages, the service operator must handle them first. No matter how clever the software is, you are still trusting a third party with your data. That is why the most critical question isn't just how the code works—it's knowing exactly who runs the service and where they are legally held accountable.

Disposable providers vary

Not all disposable services are equal, and some are open about what they are. Mailinator is run by a named company, Manybrain, Inc. It now presents itself as an email and SMS workflow testing platform for developers and QA teams, while still offering free public inboxes. Guerrilla Mail has run since 2006, keeps mail for about an hour, and publishes terms of service. Those terms say the service can end your access and delete your data without notice. An older TechRadar review found its privacy policy and terms clear, though it said little was published about security practices.

That openness counts in their favour. But it does not change how the product works. Many free disposable inboxes have no password at all, so anyone who knows or guesses the address can open them. Mailinator says openly that its free inboxes are public, and reviewers have noted the same. Public inboxes are fine for testing a signup form. They are a poor place for a password-reset link or a one-time code.

At the other end of the scale are services that publish very little about themselves. When I looked at QuickInbox.app, I could not find legal disclosures, and I saw signs of PostHog analytics and Stripe payments. These are my own observations from an informal look, they are not independently verified, and several unrelated sites use similar "QuickInbox" names. I am not accusing anyone of wrongdoing. The point is that, as far as I could tell, a user would have no easy way to learn what happens to their mail.

A checklist for any email privacy provider

Age alone does not make a service trustworthy. What matters is what the operator publishes about itself and what you can hold it to.

1. Is there a named company? A real legal entity with an address can be held accountable.
2. Is there a privacy policy and terms of service? Their absence is a red flag.
3. Are the third parties listed? Analytics, payment processors and hosting providers should be disclosed.
4. How does it make money? If you cannot tell, you may be the product.
5. Is there a track record? Years of operation, ownership history and public incidents all count.
6. Is there a way to leave? Can you export your data or point a custom domain elsewhere?
7. What happens if it shuts down? A one-person tool can disappear overnight.
8. Where is the data held, and are there independent audits? This matters for UK readers.

Disclosure is the real difference

It would be easy to say "Fastmail uses no third parties and others do". That would be false. Fastmail publishes a list of its subprocessors, which includes payment processors such as Stripe, Paddle and PayPal, plus Cloudflare for content delivery and security, and DeepL for translation of support and spam content.

So a payment processor appearing on a site is not the problem. Hiding it is. Fastmail tells you who touches your data, why, and how to contact it about it. A tiny anonymous site often cannot or will not.

Benefit 2: Fewer blocked sign-ups

Disposable email has become a cat-and-mouse game between users and the websites they sign up to.

How big is the problem for websites?

The figures below come from email-validation companies, which sell the fix, so treat them as indicative rather than gospel. One industry write-up puts temporary email at around 12% of all registrations. Another claims up to 30% of free-tier signups come from bots, scripted abuse or people using burner addresses. Website owners worry about free-trial abuse, repeated promo-code claims, fake reviews and spam, and the blunt response is to block whole categories of address.

Blocklists are large and growing

Blocking is an industry in itself. One open-source list advertises more than 110,000 disposable domains, updated daily. Lists vary widely in size, and developers are told to use free GitHub-hosted lists or paid APIs because new throwaway domains appear constantly. The oldest names are the easiest to block. Mailinator, founded in 2003, has domains that many sites reject. If a site refuses your "temporary" address, that is usually why.

Masked email sits in a different category

Careful blocklist makers separate disposable inboxes from forwarding aliases. One directory states that aliases such as SimpleLogin, duck.com, addy.io, mozmail.com and Apple's relay addresses are not disposable, because they deliver to a real, permanent inbox. Another warns against treating relay services as disposable, since Apple relay addresses belong to real iPhone users. Blocking them turns away genuine customers.

Fastmail's Masked Email addresses use a mainstream domain rather than a throwaway one. I found no evidence of fastmail.com on the disposable-domain lists I checked. Some sites apply their own rules, so the honest summary is "less likely to be blocked", not "never blocked".

Benefit 3: More control

With a disposable inbox, the operator decides when the address expires. With a masked address, you decide.

• Block or delete it when you are finished with a site, or when it starts sending spam.
• Know who leaked it. Each address belongs to one site, so spam shows you where it came from.
• Spot fakes. Messages to a Masked Email address show a masked icon in Fastmail, and opening one reveals the label you gave it. If an email you gave to a shady site pretends to be from your bank, you will know.
• Create them where you sign up. You can create Masked Email addresses from the 1Password browser extension on a sign-up page, and Fastmail also supports Bitwarden.

Where disposable email still wins

I can't claim a masked address replaces a disposable one in every case. Disposable inboxes still have a place:

• You have no mailbox with masking. Masked Email is a Fastmail feature, so you need a Fastmail account. Someone who uses Gmail and wants a one-off address will not switch provider for that.
• You want no account at all. Disposable inboxes need no sign-up and no payment. A masked address is tied to an account, so it protects your address from the site rather than your identity from your provider.
• You are a developer or tester. Tools like Mailinator exist for automated email and SMS testing, with huge numbers of test inboxes and an API. Masked email is not built for that.

Why a built-in feature beats a separate app

Most standalone alias services work by forwarding. Your mail arrives at their server, then travels on to your real inbox. That means two companies, one running the alias and another running your mailbox. Each can see your messages, and each can fail or change its terms independently.

Fastmail's Masked Email removes one of those parties. The addresses are generated and managed in Fastmail, and the mail lands in the inbox you already use. With one provider, there is one privacy policy to read and one company to hold accountable.

Fastmail is not the only option for this. iCloud+ Hide My Email and Proton, which owns SimpleLogin, offer similar same-provider aliasing. So the case for Fastmail rests on the combination below: independence, a paid-only model, published subprocessors and an open standard.

Fastmail's track record

• Founded in Melbourne in 1999 and sold to Opera Software in 2010.
• Bought back by its staff in 2013, which reclaimed the name.
• Described by one analytics firm as a privately held, independent business based in Melbourne.
• Acquired Pobox in 2015, a company founded in 1995 and one of the oldest email companies still in existence.

Its business model also changed. Fastmail said in 2012 that it would stop free sign-ups and focus on paying customers, and the remaining guest and one-time-payment accounts ended on 31 July 2017. One account of its history says it used advertising within its software for a time. I find that history reassuring. It shows a company that tried the free model, saw the conflict with privacy, and chose to charge. Its privacy policy states that it does not use profiling for personalised content or ads.

Fastmail also helped create JMAP, an open email protocol. The core specification, RFC 8620, lists N. Jenkins of Fastmail and C. Newman of Oracle as authors, and Masked Email is built on it. That is a public, reviewable standard. Masked Email itself launched with 1Password in September 2021, and 1Password's CEO said it lets people keep their online identities private while managing everything from a primary inbox.

Its policies page lists a privacy policy, a cookie policy and a Data Protection Agreement (DPA), the current version of which took effect on 1 August 2025. An archived version included a commitment to give customers prior written notice of any new subprocessor. For most individuals the privacy policy is the document that matters, because Fastmail has explained that the addendum applies to businesses handling data on behalf of others.

How the main options compare

The alias services are respectable options, and several are open source. The trade-off is that you are adding a second company to the chain.

Honest criticisms of Fastmail

A fair article has to include the downsides.

• It is not end-to-end encrypted. PrivacySavvy points out that only the servers use encryption, so the provider could in theory read your mail, and concludes Fastmail is not the best choice if privacy is your priority. Cybernews also flags the lack of end-to-end encryption and, in an older review, scored it 2.1 out of 5.
  • Fastmail's counter-argument: Fastmail defends this choice on its security page. It argues that end-to-end encryption needs both sender and receiver to support it and to have a safe way to exchange keys. It also says that in webmail the decryption code is delivered by the server itself, so it adds little protection against a compromised server. The trade-offs, it says, are fast full-text search, efficient message previews, spam checking that can read the content, and recovering your history if you lose your private key. If you need end-to-end encryption, it says you can use PGP or S/MIME in third-party apps, and it recommends Signal for the most sensitive conversations. That is Fastmail's view. Critics would reply that it still leaves the provider able to read your mail, which is the point of the criticism above.
• Jurisdiction. Fastmail is based in Australia, a Five Eyes country. One review notes its servers are in the US, though Fastmail says you can choose EU or US data residency.
• It costs money. There is no permanent free tier. Fastmail's pricing page lists a free trial of up to 30 days.
• Support. A Capterra reviewer who otherwise liked the product noted support is by email. Some Capterra reviews are incentivised, so check Fastmail's current support options.
• Switching has a cost. To use Masked Email you move your mailbox to Fastmail. If you want to stay with Gmail, a standalone alias service is the honest answer.

Aggregated scores are friendlier: one tool directory reports 4.6 out of 5 across review platforms. The fair reading is that Fastmail offers practical privacy rather than maximum secrecy. Regular readers will already know my positive feelings toward Fastmail—which I’ve highlighted in previous articles—because it strikes the right balance for everyday security. If your primary concern is stopping advertisers, blocking data brokers, and eliminating spam, it is an exceptionally strong fit. However, if your threat model involves state-level surveillance or a targeted adversary, you will likely want to pair it with an end-to-end encrypted provider.

Frequently asked questions

Is disposable email legal?

Yes, in most places. Using one to commit fraud or abuse a service is not.

Can I use a masked address instead of a disposable one?

Yes. Create a masked address for the site, then delete or block it when you are finished. If you keep the account, leave it pointing at your real inbox.

Why do websites block disposable email?

Mainly to stop fake signups, free-trial abuse and spam. The figures usually quoted come from companies that sell blocking tools, so treat them as indicative.

Are masked email addresses the same as disposable ones?

No. A masked address forwards to a permanent inbox and you can switch it off. A disposable one usually expires and may be public.

Will a masked address get blocked?

It is less likely than a classic temp-mail domain, but some sites may still reject unfamiliar addresses.

Is Masked Email free?

Not on Fastmail, which is a paid service with a free trial. Some standalone alias services have free tiers, such as Firefox Relay and addy.io.

Can I use Masked Email with my existing Gmail?

Masked Email is a Fastmail feature, so you need a Fastmail mailbox. If you want to stay with Gmail, a standalone alias service such as SimpleLogin, addy.io, Firefox Relay or DuckDuckGo Email Protection can forward to it.

Is a paid provider really more private than a free one?

Not automatically. But a subscription gives the provider a reason to protect you rather than monetise you, and it gives you a company to complain to.

The verdict: choose accountability

A masked address gives you what a disposable one promises: a barrier between your real address and the site. It also gives you a way to keep the account, fewer blocked sign-ups and the ability to switch the address off.

• One-off signup, no mailbox with masking: a disposable inbox is fine, as long as you accept it may be public and may be blocked.
• Any account you want to keep: a masked address.
• High-risk threat model: an end-to-end encrypted provider, alongside or instead.

Once you accept that someone has to run the service, the question becomes who. A named company with decades of history, a published subprocessor list, an open standard it helped write and a business model that depends on you paying is a safer bet than an anonymous tool with no terms. Fastmail is not perfect, as the criticisms above show. But its flaws are visible and documented, and that visibility is a trust signal a one-page burner site cannot offer.

Last checked: 3 October 2026 (prices, offers and figures).

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