Temp Mail vs Email Alias: Which One Should You Use?
Use temp mail when you will never need the account again; use an email alias when you want to keep the account but hide your real address. That is the whole decision. A temporary email address is a short-lived inbox that exists for minutes or hours and then disappears, so it is perfect for a one-time download or verification code and terrible for anything you log into next month. An alias is a permanent forwarding address that routes mail to your real inbox, so it is perfect for accounts you keep and pointless for a sign-up you want to forget.
Most people need both, for different jobs. This guide explains how each works, compares the major alias providers (Apple Hide My Email, Firefox Relay, SimpleLogin, DuckDuckGo Email Protection, Gmail plus addressing), and gives a plain decision rule.
What temp mail is and what it is for
A temporary email address is an address on a domain the service owns, with an inbox you read on the service's web page. There is no account, no password, and no forwarding: mail arrives at the service and is shown to you, then deleted after a set period. On this site the address is issued the moment the page loads, two countdowns show how long the address accepts mail and how long messages are kept, and the address can be extended while it is still live.
Temp mail is receive-only. You cannot reply from it, and you cannot recover it once it expires. Those are features, not bugs: a disposable address that could send would be a spam tool, and an address that never expired would just be a free email account.
It is the right choice when:
- You need a verification code or confirmation link once.
- You are downloading a gated file or reading a gated article.
- You are testing a sign-up flow on your own site.
- You are registering on a forum, giveaway, or marketplace you will not return to.
- You want zero connection between the sign-up and any address you own.
That last point is the one an alias cannot match. An alias forwards to your real inbox, so the alias provider knows your real address, and so does anyone who compromises the alias provider. Temp mail knows nothing about you.
What an email alias is and what it is for
An email alias is a second address that delivers to your real inbox. The alias provider receives mail at the alias, strips or rewrites the headers, and forwards it to you. From the sender's side, the alias looks like a normal address and keeps working for as long as you leave it active. When the sender starts spamming you, you turn the alias off and the spam stops at the provider.
Aliases exist in two flavors.
Provider-managed aliases (Hide My Email, Firefox Relay, SimpleLogin, DuckDuckGo Email Protection) generate a random address on the provider's domain for each site, forward mail to you, and let you disable or delete each alias individually. Most also let you reply through the alias so the recipient never sees your real address.
Plus addressing (Gmail's you+shop@gmail.com, also supported by Outlook, Fastmail, Proton and others) is not really an alias at all: it is your real address with a tag. Mail to you+shop@ lands in you@. It is useful for filtering and for spotting who sold your address, but it hides nothing, because anyone can strip the +shop and reach you directly.
An alias is the right choice when:
- You will log into the account again and may need a password reset.
- You want to receive ongoing mail (order updates, statements, notifications) from the sender.
- You need to reply without revealing your real address.
- You want to cut off one sender later without changing your address everywhere.
Temp mail vs alias: side by side
| Temporary email | Provider alias (Relay, SimpleLogin, Hide My Email) | Plus addressing | |
|---|---|---|---|
| Lifespan | Minutes to days; expires | Permanent until you delete it | Permanent |
| Account needed | No | Yes (an account with the alias provider) | Your existing mailbox |
| Where mail arrives | On the service's web page | Your real inbox | Your real inbox |
| Can reply or send | No | Usually yes, via the alias | Yes, as yourself |
| Password reset later | Impossible after expiry | Works as long as alias is active | Works |
| Hides your real address from the site | Yes, completely | Yes | No (tag is trivially removed) |
| Who knows your real address | Nobody | The alias provider | The site |
| Blocked by disposable-domain filters | Often (random domains) | Rarely, though some sites block known relay domains | Never, but some forms reject + |
| Cost | Free | Free tier, paid for unlimited aliases or custom domains | Free |
| Best for | One-time codes, downloads, testing | Accounts you keep | Sorting and tracing leaks |
The main alias providers, briefly
Apple Hide My Email. Built into iCloud+ (a paid tier). Generates random@icloud.com addresses when you sign up with Sign in with Apple or from Safari's autofill, forwards to your Apple ID email, and lets you reply through the alias. Deeply integrated on Apple devices, awkward elsewhere.
Firefox Relay. From Mozilla. Free tier gives a small number of masks on @mozmail.com; the paid tier removes the limit, adds a custom subdomain, and adds phone masking in some regions. Browser extension fills masks into forms. Replies are a paid feature.
SimpleLogin. Open source, now owned by Proton and bundled with Proton Mail paid plans. Unlimited aliases on the paid tier, custom domains, multiple mailboxes, reply-through-alias, and a self-hosting option. The most flexible of the four and the one power users tend to pick.
DuckDuckGo Email Protection. Free. Gives you a personal @duck.com address plus unlimited random private addresses, strips known trackers from forwarded mail, and forwards to your real inbox. No replies through private addresses at the time of writing; check their current docs.
Gmail plus addressing. Free, works today, no setup. you+anything@gmail.com reaches you. Gmail also ignores dots, so y.o.u@gmail.com is the same inbox. Good for filters, useless for privacy, and some sign-up forms reject the + character.
These providers change their free limits regularly. Check their own pricing pages before you commit; the specifics above are structural rather than exhaustive.
When an alias is the wrong tool
An alias feels like it covers every case, which is why people over-use it. It does not cover these:
You want no trace. An alias ties the sign-up to your alias account, and your alias account ties to your real address. A subpoena, a provider breach, or an account takeover follows that chain. Temp mail breaks the chain entirely.
You are testing. Developers checking that a registration email arrives do not want a hundred forwarded test messages in their real inbox. A temp mail API hands each test run a fresh address and throws it away.
You have hit the alias limit. Free alias tiers cap the number of masks. Burning one on a PDF download is a waste. Use a disposable address for the junk and save aliases for accounts.
The site blocks relay domains. Some sites that block disposable domains also block the well-known alias domains. Plus addressing gets through, but at the cost of exposing your real address. A pooled real-provider temp address, like our temp Gmail page issues when available, gets through the domain check without exposing anything, at the cost of being disposable.
When temp mail is the wrong tool
You will log in again. This cannot be stressed enough. Expired temp mail means no password reset, ever. Any store you will reorder from, any tool you will keep using, any account with payment details: alias or real address.
You need to send. Temp mail is receive-only. If the interaction involves replying, it is an alias job.
You expect ongoing mail you want to read. Shipping updates, appointment reminders, invoices. Those need an inbox you will still have next week.
The content is sensitive. Most temp mail inboxes are readable by anyone who knows the address. An alias delivers to your private inbox. For anything you would not pin to a notice board, use the alias. See is temp mail safe for the full threat model.
A decision rule you can apply in two seconds
Ask: will I ever want to log into this again?
- No → temp mail. Open the temp mail page, copy the address, use it, let it expire. If the site rejects the domain, try the temp Gmail page or generate a new address on a different domain.
- Yes, but I do not want them to have my real address → provider alias (SimpleLogin, Relay, Hide My Email, DuckDuckGo).
- Yes, and I only care about sorting my inbox, not privacy → plus addressing.
- Yes, and it is a bank, government, employer, or medical provider → your real address. Aliases add a dependency on a third party you do not want sitting between you and your bank.
People who use temp mail for everything eventually lock themselves out of something. People who use aliases for everything eventually leak their real address through a plus tag or hit a mask limit on a throwaway download. Using the right tool for each job is not complicated once the rule is clear: aliases for accounts you keep, temp mail for everything you are about to forget.
If you want the names sorted out, "burner email," "throwaway email," and "disposable email" all mean temp mail in practice. Our burner email and disposable email pages issue the same kind of address with the same two visible countdowns; the labels differ, the tool does not.