As announced in March (and later postponed), Microsoft will not disable Teams Meeting recording expiration emails by default, as initially planned.

Microsoft added a new SharePoint tenant setting DisableTeamsMeetingRecordingDeletedNotification. The rollout should be completed for commercial tenants (GCC, GCC High, and DoD clouds are postponed).

DisableTeamsMeetingRecordingDeletedNotification
This is an opt-in setting that enables or disables email notifications when a Teams meeting recording file is deleted after expiration at the tenant level. (The default value is False.)
PARAMVALUE: True | False
If the setting shows no value (neither False nor True), update your Microsoft.Online.SharePoint.PowerShell module.
To update the current setting:
Set-SPOTenant -DisableTeamsMeetingRecordingDeletedNotification <True | False>