Configure DMARC for Microsoft Office 365 Custom Domains
DMARC (Domain-based Message Authentication, Reporting, and Conformance) works with SPF (Sender Policy Framework) and DKIM (DomainKeys Identified Mail) to authenticate mail senders. This is just one additional tool in the never-ending fight against phishing and spoofing. DMARC also instructs receiving servers on how to proceed when incoming emails fail SPF or DKIM validation.
Before you can enable DMARC for your domain, you first need to have properly configured SPF and DKIM.
Restore deleted Microsoft / Office 365 Shared Mailbox
If you delete an Office 365 Shared Mailbox via the Microsoft 365 Admin Center > Users > Deleted Users, it will restore the associated user account in Blocked state with ExRemoved... address, but the Shared Mailbox itself will still be nowhere to be found.
Microsoft 365 SharePoint - View folder sizes
Microsoft 365 SharePoint doesn't show folder sizes in any prominent place. You also can't click on Details or Properties as you would do in Windows.
Luckily it's quite easy to view folder sizes if you know where to look.
The quickest way is simply to add /_layouts/15/storman.aspx to the end of your SharePoint site URL. i.e. https://my_company.sharepoint.com/sites/Company-Data/_layouts/15/storman.aspx.
Another option, which doesn't require remembering the URL:
Enable US landline dial-in number for Teams Meetings
- Added free “Microsoft Teams Audio Conferencing with dial-out to USA/CAN” license for every user who needs this functionality.
- Microsoft 365 Teams Admin Centre > Meetings > Audio Conferencing > Add a new Custom Policy with a US number in your preferred State.
- Assign the policy to your users.
Microsoft Office 365