A one time email address is exactly what it says: you use it once, for a single purpose, and never need it again. No account to maintain, no inbox to clean, no spam to deal with afterward. BurnerInbox generates one for you in under a second — free, anonymous, and ready to receive email immediately.
A one-time email is a subset of disposable email — it implies you intend to use the address only once. A disposable email might be reused a few times. For maximum one-time-ness, use a random BurnerInbox address (not a custom one) — then you'll never accidentally reuse it. For something you might need to revisit, see custom temp email instead.
No — BurnerInbox does not delete addresses. The inbox remains accessible if you return to it. "One-time" refers to your intent to use it once, not a technical expiry. This is intentional: it means if you receive a follow-up email you weren't expecting (a password reset, a second verification step), the inbox is still there.
A one-time address from BurnerInbox can also serve as an anonymous email. The platform you sign up on receives a valid email, you receive their confirmation, and then the address is — for all intents — gone from your life. For one-time sign-up scenarios, it's the cleanest possible solution.