- Add searchMailboxMessages, deleteMailboxMessage, moveToDeletedItems to MsGraphClient
- POST /api/mimecast/mailbox-remediate: search, move, delete actions with permission error handling
- DeliveredAnalysisDialog: Remove from mailbox panel with search → confirm → delete flow
- Shows matching messages in mailbox with checkboxes, received time, read/unread status
- Moves selected to Deleted Items (recoverable) via Graph API
- Surfaces clear permission guidance if Mail.ReadWrite not yet granted
- New POST /api/mimecast/delivered route using message-finder/search API
- DeliveredMailTab: search by recipient, sender, subject, time range (6h–7d)
- Results table with status badge, spam score, row tinting for high/moderate risk
- Summary stats bar: total / high spam (≥10) / moderate (5-9) / clean counts
- Sort by date or spam score; filter by status (accepted/held/rejected/bounced)
- DeliveredAnalysisDialog: explains why high-score mail got through, envelope mismatch detection, actionable remediation steps (block domain, adjust policy threshold, report)
- MimecastDeliveredMessage interface + searchDeliveredMessages() method in client
- Add releaseHeldMessage() to MimecastClient (POST /api/gateway/hold-release)
- Add POST /api/mimecast/held/release route
- HeldMailTab: tenant selector before load (defaults to Wulf), only fetches selected tenant
- Release button per row with spinner + optimistic removal on success
- Error shown inline under Release button if release fails
- export const dynamic = 'force-dynamic' on /api/mimecast/held to prevent Next.js caching
- Add AbortController timeout (20s) per request in MimecastClient.request()
- getHeldMessages: 403 fallback without admin:true flag for tenants lacking permission
- Reduce maxMessages default to 100 (10 pages) to stay within route timeout
- Show 'permission denied' tooltip in tenant badge for 403 errors
- Surface HTTP errors in HeldMailTab instead of silently failing
- Add missing favicons: sentinelone.ico, itglue.ico, mimecast.ico
