Некоторые из сервисов iCloud (включая Mail) лежат прямо сейчас. Какой-то невезучий 2021 для почтовых сервисов. https://www.macrumors.com/2021/02/03/icloud-services-outage-2/
MacRumors
iCloud Drive, Notes, Photos, and iCloud Backup Experiencing Issues [Update: Fixed]
Several of Apple's services are experiencing an outage at the current time, with Apple noting service interrupts for iCloud Backup, iCloud Drive,...