Paul O'Brien

Paul O'Brien

Paul O'Brien (CBCI) works in Corporate Resilience and writes about email privacy, infrastructure, and software systems. He delivers independent technical teardowns and practical guides to owning your digital footprint.

72 posts

Spamhaus & the Shape of Modern Email Filtering

Spam didn’t disappear — it was pushed out of sight. Reputation systems like Spamhaus reshaped email abuse at internet scale, trading noisy volume for quieter, more dangerous attacks. This is the infrastructure that keeps email usable — and the compromises it relies on.

Spamhaus & the Shape of Modern Email Filtering