Messages addressed to distribution groups may be identified as spam and/or delivered to the recipients Junk E-mail folder


When an email message is addressed to a distribution group (either in the 'To:' or 'CC:' fields) the message is delivered to the recipients Junk E-mail folder instead of the Inbox. At the same time, the Return-Path header on the received message is blank and only contains anchor tags.


If the group is synchronized to Office 365 from an on-premise Active Directory, set the attribute ReportToOriginator to TRUE in the properties of the distribution group in the on-premise Active Directory site.

These changes will not take effect until the on-premises Active Directory domain has been synchronized and replicated in Office 365.

Further information relating to this can be found in the following Microsoft KB article.

If no on-premise Active Directory exists, the group properties can be amended in Office 365 using Windows Powershell.

  1. Open Windows PowerShelland run the following PowerShell command to create a variable which will gather logon credentials:
    $credential = (get-credential)
    When you press Enter, you are prompted to enter Office 365 administrator credentials.

  2. Run the following Powershell command:
    Import-PSSession (New-PSSession -ConfigurationName Microsoft.Exchange -Credential $Credential -ConnectionURI -Authentication Basic -AllowRedirection) -AllowClobber
  3.  Run the following Powershell command:
    Get-DistributionGroup <Group Email Address> | fl *ReportToOriginatorEnabled*
  4. If the value returned is False, run the command below to change it to True:
    Set-DistributionGroup <Group Email Address> -ReportToOriginatorEnabled $true

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