MailOnce Knowledge Center

How MailOnce Works

Explore the systems behind creating, receiving, verifying, protecting and expiring a temporary inbox.

Explore how MailOnce works, from creating an address to receiving messages and managing inbox expiry.

Create your temporary email

Create an address, choose random or custom naming, use MailOnce without an account, and understand address changes and limits.

Incoming mail, real-time delivery, refresh behavior and delivery troubleshooting.

OTP detection, verification codes, confirmation links and common verification problems.

When temporary email reduces exposure of your primary address.

Expiry, Extend Inbox, the free lifetime ceiling and what happens after an inbox ends.

Open the same inbox on another device using QR requests and browser approval.

Verification links, suspicious content, remote images and safer message handling.

Multiple domains, blocked disposable addresses and website acceptance.

Inbox privacy, retention boundaries and MailOnce data deletion behavior.