Exchange Online protection, phishing and BEC defense, DKIM, DMARC and SPF, plus Teams and SharePoint security and external sharing controls.
External sharing is on by default across SharePoint Online. Here are the four sharing modes, how authenticated and anonymous external sharing actually work, and where to lock it down.
Office 365 ATP ships with Safe Attachments and Safe Links switched off. Here is what each feature does and the step-by-step config to turn them on.
Inter-tenant collaboration in Exchange Online comes down to two controls: user-level sharing policies and organization relationships. Here is what each one does and where to set it.
Office 365 message encryption needs the right license, an activation step, and transport rules to fire automatically. Here is the full setup and the recipient experience.
