Temporary email or an email alias?

These get recommended interchangeably and they are not substitutes. Picking the wrong one does not fail immediately — it fails in three months, when you need a password reset sent to an address that no longer exists.

The difference in one line

A temporary address is designed to stop existing. An alias is designed to last, while hiding the address behind it.

Use a temporary address when

• You want to read one thing — a download, a PDF, a forum you will never post in.
• The account is worth nothing to you and you will never log back in.
• You would not care if it vanished tomorrow, because it will.

There is no account to create and nothing to clean up afterwards. That is the entire appeal and it is a real one: an alias you made for a site you visited once is still an alias you have to manage forever.

Use an alias when

• You intend to keep the account.
• A password reset might need to reach you.
• You want to know which company leaked your address, and cut that one off.

That last point is what aliases are genuinely good at. A different alias per site means a leak tells you exactly who leaked it, and you disable one address instead of changing the one you have used for a decade.

Where this service sits

SpareInbox is the first kind, with the part everybody skips actually done: it reads the message when it arrives and puts the verification code or the confirmation link at the top of the page, so you never open the email. How that works.

It is deliberately not the second kind. Aliases need accounts, passwords and management, and that is a different product — one where you are the customer rather than someone passing through.

Do not use either for

Banks, exchanges, government services, or anything holding money. Those want the address you actually control and check, and putting a layer between you and a recovery email is a way to lose an account rather than protect it. What a throwaway address does and does not protect.