Manage mailbox permissions

Update permissions for the sales shared mailbox so Jose Reyes can add and remove delegates and Ana Patel can only read and respond. Revoke Mary Grant's delegate rights immediately. After the changes, email Jose, Ana, and Mary with a one–sentence summary of what changed and ask Jose to confirm he can manage delegates by Friday noon.

Before I edit mailbox permissions, make the policy easy to review. Put the current permission map first (who can full-access, send-as, send-on-behalf, manage-delegates), highlight any conflicts (two people set as manager of delegates), call out what would block approval (no backup reviewer, expired compliance waiver), and give the exact wording I should send to recipients to avoid questions.

I just revoked Mary Grant's delegate right on the sales mailbox and she emailed asking why she still sees messages. I can't tell if the change didn't apply, if her client cached data, or if she has another overlapping permission. What is the most probable cause and the one thing I should check first to resolve it quickly without escalating to IT?

Every quarter I spend hours reconciling mailbox permissions because people inherit rights after role changes and IT tickets lag. Where am I consistently losing time — permission naming, handoff timing, or lack of ownership — and what single process or habit should I introduce so permission edits stick and I stop firefighting on Fridays?