feat: Mimecast multi-tenant held mail viewer
- migration 062: mimecast_tenants table (company_id, client_id/secret, account_code)
- Seed Wulf (CUSA13A95) + Seubert (CUSA96A181) tenants
- MimecastClient.getHeldMessages(): full pagination via meta.pagination.next cursor
(API always returns 10/page regardless of pageSize param, totalCount in meta)
- getMimecastClientForTenant() factory for per-tenant instantiation
- GET /api/mimecast/held?tenantId=&recipient= — fetches all tenants in parallel,
merges + sorts by date, returns per-tenant counts + combined messages[]
- Held Mail tab on /admin/sync/mimecast (on-demand load, recipient filter,
tenant badges, policy filter dropdown, DMARC/impersonation highlighted red)
lorentz
fcdec8e38b