How Disposable Emails Actually Work (Under the Hood)

Ever wondered how an email sent to a random address you just made up actually arrives in your browser seconds later? It's a neat piece of infrastructure.

1. The catch-all domain

A temp mail provider owns domains and configures their DNS MX records to point at its own mail servers. Crucially, it accepts mail for any username at that domain — a "catch-all" setup.

2. The SMTP receiver

When someone sends mail, their server connects to the provider's SMTP receiver (often Haraka or Postfix). The receiver accepts the message, then a parser extracts the sender, subject, body, and attachments.

3. Routing to your inbox

The parsed message is matched to any live inbox with that address and pushed to your browser in real time over Server-Sent Events or WebSockets.

4. Self-destruction

Each inbox has a TTL. When it expires, a background job permanently deletes the messages — no archive, no recovery.