How temporary email works under the hood

When someone emails name@emailsify.com, their mail server looks up the domain's MX records. Those records point at the servers that accept mail for the domain.

The sending server connects to the receiving server and transfers the message using SMTP. A catch-all setup accepts mail for any local part, so addresses do not need to be created in advance.

The message is parsed into subject, sender, text and HTML parts, trimmed to a safe size, and written to a database keyed by the recipient address.

Opening the inbox reads whatever is stored for that address. A timestamp marks each message, and anything older than 2 hours is ignored and purged.

Because any address is valid, the only thing protecting an inbox is that nobody else knows its name. Treat the contents as public.