It is important to distinguish between blocking and unsubscribing:
When a sender is blocked, their emails are either: gmail blocklist
Gmail (Google Workspace and personal Gmail) maintains a to protect users from spam, phishing, and malicious email. Unlike public DNS-based blocklists (e.g., Spamhaus), Gmail’s blocklist is proprietary and not publicly searchable. It operates at multiple layers: IP reputation, domain reputation, and content filtering. It is important to distinguish between blocking and
Prevent phishing attempts from known malicious addresses. How to Block a Sender in Gmail gmail blocklist
There is for Gmail. Recovery relies on improving sender reputation.