Messages sent to SharePoint groups generate an NDR

Scenario:

When using Exclaimer Cloud - Signatures for Office 365, messages sent to SharePoint groups are not delivered and the sender receives a Non Delivery Report (NDR).

Cause:

This issue occurs because the sender is not authenticated and so the message is not sent.

Resolution:

As a workaround, sender authentication can be disabled via PowerShell.

  1. Run PowerShell (as an administrator).
  2. Run the following command and enter Office 365 Administrator credentials:
    $UserCredential = Get-Credential
  3. Connect to Office 365:
    $Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $UserCredential -Authentication Basic -AllowRedirection    
  4. Run the following command:
    Import-PSSession $Session
  5. To obtain a list of SharePoint groups, run the following command:
    Get-UnifiedGroups
  6. Locate the required group and note the Group Name.
  7. Run the following command, replacing GroupName with the name of the group identified in the previous step:
    Set-UnifiedGroup -identity GroupName -RequireSenderAuthenticationEnabled $False    

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