Senders — Blocked

A list (also known as a blacklist or deny list) is a core email security feature that allows users or administrators to prevent incoming messages from specific email addresses, domains, or IP addresses. When a sender is blocked, their messages are typically rejected, quarantined, or routed directly to the spam/junk folder—without reaching the recipient’s inbox.

Blocking mechanisms generally operate on two tiers: the User Tier (Local) and the Gateway/Server Tier (Global). blocked senders

The future of blocked senders lies in .