How to forward incoming email messages to HelpDesk address in Office365 Outlook — HelpDesk for Office 365, MS Teams, and SharePoint 1.x documentation
New outbound spam options in protection portal include the ability to limit senders to [x] number of recipients per day. : r/Office365
How to Enable Outgoing Spam Filtering Using SpamAssassin? - Interserver Tips
Outbound spam filter policy Archives - Office 365 for IT Pros
Outbound Spam Filter
How to restrict sending to max 20 x recipients outbound for user mailboxes and allow more for systems sending out. · Issue #2729 · MicrosoftDocs/microsoft-365-docs · GitHub
Microsoft Office 365 email security defaults are bad, so fix them!