Temporary Email vs Email Aliases: Which Is Right for You?

Aliases forward; disposable inboxes expire

The distinction is mechanical, and it decides everything downstream.

An alias is a relay to your real inbox

When you create an alias, the provider registers a new address and points its mail at the inbox you already use. A message sent to r4nd0m@simplelogin.com is received by the alias service, stripped of some trackers in most cases, and forwarded to your Gmail, Proton, or iCloud inbox. The sender never sees your real address; you read and (on paid tiers) reply as if nothing changed. The alias persists indefinitely, and you can disable any single one the moment it starts attracting spam.

That persistence is the point. Privacy Guides recommends dedicated aliasing services over the older trick of plus addressing (you+shop@gmail.com) precisely because "websites, advertisers, and tracking networks can trivially remove anything after the '+' sign," exposing your base address. A real alias has no recoverable base.

A disposable inbox is the destination, and it self-destructs

A temporary inbox has no relationship to your real address. You open a tool like TempMailSpot, receive an address instantly with no signup, and mail arrives in that throwaway inbox directly. There is nothing to forward and nothing to trace back. When the timer runs out, the address and everything in it are gone.

We run a disposable-email service, and in practice the most common single use is a confirmation code that needs to land in seconds and never be seen again. The address is meant to be forgotten. That is a feature for one-time signups and a liability for anything you expect to log into twice.

One quick table to anchor the rest

The four major alias services, accurately described

All four below are forwarding services: mail ends up in your real inbox. They differ on price, openness, encryption, and where they quietly fall short.

SimpleLogin (Proton)

SimpleLogin is fully open source across server, extensions, and apps, and is the only email forwarding solution that can be self-hosted. Proton acquired it in April 2022; the company stated the service would "continue to operate as an independent service" with its Paris entity intact and the codebase "100% open source." On retention, SimpleLogin's privacy policy says it "does not retain email content" and that messages are "removed from servers immediately upon delivery," with IP logs older than seven days deleted; infrastructure sits in Germany, Switzerland, the Netherlands, and France.

The free plan caps you at 10 aliases. SimpleLogin's pricing page (checked 29 May 2026) lists Premium at $4/month or $36/year for unlimited aliases, unlimited custom domains, PGP encryption, a catch-all domain, five subdomains, and 50 directories. One gating detail matters for outbound mail: free users can reply to messages an alias already received, but initiating a brand-new email to a new contact requires a paid plan.

addy.io (formerly AnonAddy)

addy.io is open source under AGPL-3.0, built by UK developer Will Browning, with self-hosting fully supported; its privacy policy places servers in the Netherlands with UpCloud and states GDPR compliance, and the service supports per-recipient GPG/OpenPGP encryption you can toggle on or off. addy.io's free plan gives unlimited standard aliases but caps shared-domain aliases at 10 with a single recipient and 10 MB of monthly bandwidth. Pro runs $3/month billed annually (or $4/month monthly) for unlimited shared-domain aliases, 20 custom domains, 30 recipients, and unlimited bandwidth; a cheaper Lite tier at $1/month billed yearly also appears on the live pricing page.

Firefox Relay (Mozilla)

Relay creates email "masks" and removes common trackers hidden in links, images, or attachments before forwarding; creating a mask requires a Mozilla account. The free limit recently changed: Firefox 150.0.1 release notes (April 2026) state that "all Relay users can now create up to 50 email masks." Mozilla's own Premium FAQ still references the old limit of 5 in its downgrade language, so treat that page as not yet updated. Replying is the real free-versus-paid line: only Premium lets you "reply to forwarded messages," with Relay hiding your real address and a cap of up to 100 replies per day. We are not quoting a Relay Premium price here because Mozilla's live pricing sits behind a waitlist with no figure shown; check relay.firefox.com for the current rate.

Apple iCloud+ Hide My Email

Hide My Email generates random addresses that forward to your personal inbox and is included in every paid iCloud+ tier (US prices, May 2026: 50 GB at $0.99/mo, 200 GB at $2.99/mo, 2 TB at $9.99/mo, 6 TB at $29.99/mo, 12 TB at $59.99/mo). It is not on the free 5 GB tier. Apple's support guide confirms you can deactivate and later reactivate addresses rather than only deleting them, but requires an active subscription. Two caveats are worth knowing before you commit. First, if you cancel iCloud+ you lose the ability to view or manage your Hide My Email addresses, while mail may still forward. Second, the masking is from companies, not courts: in March 2026, Apple provided the FBI with the real iCloud address behind a Hide My Email alias under legal process, disclosing the holder's full name and records for 134 anonymized accounts.

A free option that does neither tier well or badly: DuckDuckGo

If you only want tracker-stripping forwarding with no paid plan, DuckDuckGo Email Protection is free, hands out unlimited @duck.com addresses, removes hidden trackers, and supports replying from aliases. It is a reasonable starting point before you decide whether SimpleLogin or addy.io is worth paying for.

Side-by-side: aliases vs a disposable inbox

Pricing and limits below reflect provider pages as of 29 May 2026; treat them as a starting point and confirm on the source before relying on a number.

What the table does not show: getting blocked

One practical wrinkle separates the two categories. The disposable-email-domains blocklist is used by PyPI and many other sites to reject signups from known throwaway domains, so a temporary inbox is occasionally refused at registration. Alias services that use custom or less-recognized domains are far less likely to trip those filters. If a site rejects your disposable address, that is usually the signal to switch to an alias instead.

What the table does not show: anonymity

No forwarding alias is anonymous to its provider. The service knows your real inbox, holds your account, and can be compelled to disclose it, as the Apple-FBI case above demonstrated. A disposable inbox carries no account, no payment trail, and no stored identity, which is why it is the only one of the two that offers genuine anonymity for a throwaway interaction. For more on that line between privacy and anonymity, see our disposable email vs regular email comparison.

Which to use, by job

Match the tool to whether you ever want to hear from the sender again.

Use an alias when you are keeping the account

• A shopping site, marketplace, or subscription you will reorder from
• A forum or community where you participate over time
• Any login that needs password resets, 2FA codes, or security alerts to keep reaching you
• Cases where you want to disable one sender's address later without changing your real inbox

The motivation is widely shared: 68% of Americans say they are concerned about how their personal data is used, and aliases let you compartmentalize without abandoning long-lived accounts. They also blunt the data-broker economy, an industry estimated above $250 billion that thrives on linkable real addresses.

Use a disposable inbox when you are discarding the interaction

• One-time email verification to read a gated article or grab a download
• Free trials and apps you are evaluating before they earn a real address
• Coffee-shop, airport, and hotel Wi-Fi portals harvesting addresses for marketing lists
• Contest entries and one-off promos famous for being sold on

The stakes here are mostly spam volume: 47.27% of all email worldwide in 2024 was spam, and every real address you hand to a throwaway signup is a candidate for that flood. A disposable inbox absorbs it and then disappears. TempMailSpot fits this job specifically: no registration, new mail appears automatically within seconds (the inbox polls aggressively for the first minute and a half, then settles into a slower check), a 10-minute default expiry you can extend without limit, PDF/JSON/EML export if you need to keep a receipt, and a CAPTCHA-gated send feature for the rare case where you must reply to a code, which most disposable rivals cannot do at all.

When neither is right

Reserve your real address for the small set of accounts where loss of access is unacceptable: your bank, your healthcare and government logins, your employer, and the handful of people who actually email you. Breach exposure compounds over years; with over 17.5 billion compromised accounts tracked across known breaches and phishing involved in 36% of breaches, the fewer places your primary address appears, the smaller your blast radius. For the broader framing, our complete guide to temporary email covers where disposable mail fits in a privacy stack.

A simple three-tier routing rule

You do not have to choose one tool forever. Route each signup by how much you trust it and whether you need it again.

1. Discard tier, a disposable inbox. Any site you will not revisit: one-time downloads, trials, Wi-Fi portals, contests, and any service that looks sketchy or has a poor breach history. Use TempMailSpot, grab the code, let it expire.
2. Keep-but-compartmentalize tier, an alias. Shops, forums, SaaS logins, anything needing two-way contact or recovery. Give each its own alias from SimpleLogin, addy.io, Relay, Hide My Email, or DuckDuckGo so a single leak never touches your real inbox, and disable the alias if it starts attracting spam.
3. Trusted tier, your real address. Bank, healthcare, government, employer, close contacts. Nothing else.

In day-to-day use the test is one question: do I want this sender to reach me next month? If yes, an alias. If no, a disposable inbox. That single rule resolves the large majority of signups without further thought, and it keeps your primary address out of the marketing and breach pipeline where most inbox damage originates.