Microsoft has announced that they will automatically enable the emailing of tips and training information to all Office 365 and Microsoft 365 users starting on November 29th 2018. Microsoft is stating that a setting will be enabled by default that allows Microsoft to send emails to users that contain training information related to the subscriptions they belong to. If you are an Office 365 admin and do not wish your organization’s users to receive these emails, you can disable the setting when it is enabled on Nov. 29th. Many admins are not happy that Microsoft has decided to send their user’s emails that have not been approved the user’s organization.
Source: https://www.bleepingcomputer.com/news/microsoft/microsoft-will-soon-send-your-office-365-users-tips-and-training-emails/