#Messages and Mail Storage Issue
7 messages · Page 1 of 1 (latest)
Messages issue: If the messages are syncing in iCloud, it’ll probably also be deleted in iCloud.
Mail issue: Do you have any email/calendar accounts linked?
assuming you enabled mail access, it’s probably downloading some emails from your Google account. Unless it does that regardless of mail being enabled or not
The storage taken by #1 is not specifically related to iCloud Mail. It is the storage used by the Mail app on your device, including any cached / downloaded mail regardless of source.