A shared mailbox is an email account used by a team, department, or role instead of one individual. Access is controlled with permissions, so multiple users can read, send, or manage mail without sharing a personal password. It is commonly paired with delegation, audit logs, and role-based access rules.
In cyber security, shared mailboxes matter because they support least privilege and continuity. They let organizations keep service addresses like support@ or finance@ working during absences, turnover, or incident response without exposing a private inbox. Properly configured shared mailboxes reduce password sharing, simplify monitoring, and make account ownership clearer. Attackers may target them because they often receive sensitive requests, password resets, invoices, or alert messages. Defenders should restrict who can access them, review permissions regularly, and separate shared operational mail from personal correspondence.