Hello, I plan to migrate [mailbox scope] in Madrid, with a proposed switch window of [period]. Please explain how incoming mail will be tested on the new system, how mail still arriving on the old system will be checked, and how messages not yet transferred will be recorded. Who handles these checks and follows up discrepancies? How are the results confirmed, and what conditions must be met before checks on the old mailboxes stop? Please address incoming-mail checks separately from historical-mail migration. The switch is not yet authorised.
