Nullbox – Email aliasing with inbound decision control

Summary: Nullbox is an open-source email aliasing service that manages inbound messages by forwarding, quarantining, or dropping them based on explicit rules. It uses a learning mode to identify trusted senders, then restricts delivery to known contacts, minimizing exposure to unwanted emails and leaks.

What it does

Nullbox processes incoming emails using metadata to decide whether to forward, quarantine, or drop messages. New aliases begin in a learning phase to build a trusted sender list, after which only approved senders are allowed.

Who it's for

It is designed for users seeking controlled email aliasing that prevents inbox clutter and protects privacy by limiting forwarded messages to trusted senders.

Why it matters

Nullbox addresses the issue of blind forwarding in typical alias services by enforcing sender-based filtering, reducing unwanted emails and exposure from leaked addresses.