The third item off the “genuinely zero” list. Mailbox Storage already showed per-mailbox usage but was purely a display page. A comparable panel’s Email Disk Usage tool goes one step further, letting the owner clear out what is eating space, specifically Trash and Junk, without going through webmail folder by folder.
Scoping against the real feature, not a guess
That tool is narrow: essentially “Empty Trash” and “Empty Junk” per mailbox. That is the scope here, deliberately smaller than a full bulk-delete tool.
Why the mail server’s own tool, not IMAP
Admin-side cleanup cannot authenticate as the mailbox, because the panel never keeps a mailbox’s password after creation. The purge therefore uses the mail server’s own supported tooling, which keeps its index and cache files consistent, unlike a raw file delete that would leave stale message numbers and unread counts behind.
Trash/Junk sizes, not just a purge button
The usage report now includes Trash and Junk sizes per mailbox, so the UI shows “Trash: 1.2 MB, Empty” rather than a blind button. The button appears only when there is something to empty.
Safety
The folder is restricted to Trash or Junk at both the application and the provisioning layers, ownership is checked as for other per-mailbox actions, and the button uses the panel’s own confirmation modal.
Verified
9 new tests; full suite 1,744 and the code-style check green.
Live-verify addendum: two real bugs, both satellite-related
Testing against a disposable mailbox on a linked Mail Only satellite surfaced two bugs that only exist on the cross-server path:
Bug 1: stale satellites. Trash/junk sizes stayed at zero because both linked test satellites were several releases behind; our update step for them had been skipped for a few releases. It now runs after every release.
Bug 2: the new action was not on the satellite’s accepted-action list. With satellites current, the purge still failed with an empty error. Fixed in v0.16.55 with a regression test confirming the action is reachable through the real dispatch route.
With both fixed, the full loop was re-run for real: usage showed the expected sizes and purging Trash and Junk emptied them. The disposable mailbox was cleaned up afterward.