MailTips for Dynamic Distribution Lists - wrong number of recipients


  • We use Exchange 2013 and Outlook 2013. We have a Dynamic Distribution List ( configured on Exchange. It contains 75 users, I confirmed it using below cmdlets in Exchange management shell

    $all = Get-DynamicDistributionGroup
    Get-Recipient -RecipientPreviewFilter $all.recipientfilter

    When I use Outlook to create a new email to there is a MailTip displayed mention about 87 of recipients, it should be 75 users. 

    Settings on our Exchange servers are as below:

    [PS] C:\Windows\system32>Get-OrganizationConfig | fl *mailtip*
    MailTipsAllTipsEnabled                : True
    MailTipsExternalRecipientsTipsEnabled : False
    MailTipsGroupMetricsEnabled           : True
    MailTipsLargeAudienceThreshold        : 25
    MailTipsMailboxSourcedTipsEnabled     : True

    Any idea how to troubleshoot it?

    Monday, December 22, 2014 8:27 AM

All replies

  • Hi,

    Please compose an email message addressed to this Dynamic Distribution Lists in OWA and Outlook Online mode and check whether the issue can be reproduced.

    Also run the following command to check your MailTip settings for this problematic group:

    Get-DynamicDistributionGroup -Identity Group_Name | FL Identity,*tip*


    Winnie Liang
    TechNet Community Support

    Tuesday, December 23, 2014 9:13 AM
  • In OWA it looks exactly the same, mailtip shows 87 recipients instead of 75

    MailTip settings look like below:

    [PS] C:\Windows\system32>Get-DynamicDistributionGroup -Identity all | FL Identity,*tip*

    Identity            :
    MailTip             :
    MailTipTranslations : {}

    Tuesday, December 23, 2014 9:29 AM
  • Hi,

    In Exchange 2013, group metrics data is stored in the msExchGroupMemberCount and msExchGroupExternalMemberCount attributes on the group object in Active Directory. Please check these attributes in ADUC.

    Additionally, here is an article about Group metrics and MailTips in Exchange 2013, please refer to:


    Winnie Liang
    TechNet Community Support

    Thursday, December 25, 2014 9:00 AM
  • Hi,

    Any updates?


    Winnie Liang
    TechNet Community Support

    Friday, December 26, 2014 9:33 AM
  • In Active Directory attributes for this group are as below

    msExchGroupMemberCount = 87msExchGroupExternalMemberCount = 0 

    Regarding files under %ExchangeInstallPath%GroupMetrics there is only cookie file modified yesterday and it contains as below:

    DC=domain,DC=com;12/28/2014 13:11:15;05/14/2013 20:02:24

    Just created new dynamic distribution group with the same filter as for group all (for test purpose). There is no MailTip for this new group now. Is it possible to force \ speed up group metrics generation?

    Monday, December 29, 2014 9:00 AM
  • Hi,

    Please run the following command to have a try:

    Set-MailboxServer MBX1 -ForceGroupMetricsGeneration $true


    Winnie Liang
    TechNet Community Support

    Friday, January 2, 2015 9:42 AM
  • It does not resolve a problem
    Monday, January 5, 2015 7:00 AM
  • bbelko - it's been awhile on your last post - but I'm having same issue and wondering if you found solution?

    Thursday, November 19, 2015 4:43 PM
  • Hello,

    any solution for this?



    Wednesday, February 14, 2018 6:34 AM
  • I am also looking for a solution to resolve this.
    Wednesday, May 16, 2018 10:57 AM