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Configure DMARC for Microsoft Office 365 Custom Domains

Email

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.

Read more: Configure DMARC for Microsoft Office 365 Custom Domains

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.

ExRemoved... mailbox

Read more: Restore deleted Microsoft / Office 365 Shared Mailbox

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.

SharePoint Site Collection storman.aspx

Another option, which doesn't require remembering the URL:

Read more: Microsoft 365 SharePoint - View folder sizes

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 365 Teams Admin Centre > Meetings > Audio Conferencing

June 2023
Microsoft Office 365
Microsoft Teams

  1. Users can't see images on Office 365 SharePoint Intranet site
  2. Publicly accessible Google API key for Google Cloud Platform...
  3. Office 365 keeps automatically removing user from Teams Group
  4. Office 365 Admin Portal - [EXO Outage] NotFound received from
  5. Teams profile picture - There was a problem saving the photo
  6. Bitdefender blocked this page - PrivacyThreat.PasswordStealer.HTTP
  7. Office 365 Compliance Content Search - You can't preview search results...
  8. Office 365 - The command you tried to run isn't currently allowed in your organization
  9. Can't access SharePoint site - ERR_INVALID_RESPONSE
  10. Office 365 - disappearing incoming emails (sent to quarantine)

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