To distribute messages to a group of users, you can use dynamic distribution groups (mail-enabled Active Directory group objects).
Distribution groups have a defined list of members, but for dynamic distribution groups, you can define filters and conditions. Every time a message is sent to the group, the list of members changes dynamically based on the defined criteria.
In the Active Roles Web Interface, you can create, manage or delete cloud-only dynamic distribution groups in Directory Management > Tree> Azure > <azure-tenant-name> > Dynamic Distribution Groups. Dynamic distribution groups that are created in the Active Roles Web Interface are synchronized to the Exchange admin center.
For more information about cloud-only dynamic distribution groups, see Manage dynamic distribution groups in Exchange Online in the Microsoft Exchange Online documentation.
 
    
You can create a new dynamic distribution group with the Create New Dynamic Distribution Group action of the Active Roles Web Interface.
To create a new dynamic distribution group
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In the Active Roles Web Interface, navigate to Directory Management > Tree > Azure > <azure-tenant-name> > Dynamic Distribution Groups. 
Figure 210: Directory Management > Tree > Azure > <azure-tenant-name> > Dynamic Distribution Groups — Listing the Azure dynamic distribution groups in the Azure tenant.   
 
 
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Click Create New Dynamic Distribution Group. 
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In General, configure the settings that your organization requires for setting up the dynamic distribution group. 
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Enter the Name of the dynamic distribution group. 
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(Optional) Enter the Display name of the dynamic distribution group. 
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(Optional) Enter a Description for the dynamic distribution group. 
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Primary SMTP Address (leave blank for default value): Enter the name and select a domain. The default value of the primary SMTP address is the name and the domain name of the mailbox. For example, mailbox1@activeroles.onmicrosoft.com, where mailbox1 is the name and activeroles.onmicrosoft.com is the domain name. 
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(Optional) Hide this group from the global address list (default: selected) Select this check box if you do not want the group to appear in the address book and other address lists defined in your Exchange organization. 
 
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To continue, click Next. 
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In Owners, set the owner of the dynamic distribution group. 
NOTE: You can only set one owner for a dynamic distribution group. 
 
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To add or change the owner of the dynamic distribution group, click Modify, select the user and click OK. 
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To view the Azure AD properties of the owner, click Properties. 
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To remove the owner of the dynamic distribution group, select the users and click Remove. 
 
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In Members, set the type of recipients that will be members of the dynamic distribution group. 
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To apply your changes, click Finish. 
  
    
You can view or modify the properties of a dynamic distribution group with the Distribution Group Properties action of the Active Roles Web Interface.
To view or modify the properties of a dynamic distribution group
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In the Active Roles Web Interface, navigate to Directory Management > Tree > Azure > <azure-tenant-name> > Dynamic Distribution Groups. 
Figure 211: Directory Management > Tree > Azure > <azure-tenant-name> > Dynamic Distribution Groups — Listing the Azure dynamic distribution groups in the Azure tenant.   
 
 
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Select the dynamic distribution group whose properties you want to view or modify. 
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Click Dynamic Distribution Group Properties. 
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In General, set the following general properties of the dynamic distribution group: 
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Enter the Name of the dynamic distribution group. 
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(Optional) Enter the Display name of the dynamic distribution group. 
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(Optional) Enter a Description for the dynamic distribution group. 
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Primary SMTP address: The primary Simple Mail Transfer Protocol (SMTP) address of a user account to be used for server-to-server authorization or access delegation. You cannot modify this value because it is filled automatically. 
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(Optional) Hide this group from the global address list (default: selected) Select this check box if you do not want the group to appear in the address book and other address lists defined in your Exchange organization. 
 
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In Owners, set the owner of the dynamic distribution group. 
NOTE: You can only set one owner for a dynamic distribution group. 
 
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To add or change the owner of the dynamic distribution group, click Modify, select the user and click OK. 
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To view the Azure AD properties of the owner, click Properties. 
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To remove the owner of the dynamic distribution group, select the users and click Remove. 
 
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In Members, set the type of recipients that will be members of the dynamic distribution group. 
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To apply your changes, click Save. 
  
    
You can view or modify the members of a dynamic distribution group with the Members action of the Active Roles Web Interface.
To view or modify the members of a dynamic distribution group
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In the Active Roles Web Interface, navigate to Directory Management > Tree > Azure > <azure-tenant-name> > Dynamic Distribution Groups. 
Figure 212: Directory Management > Tree > Azure > <azure-tenant-name> > Dynamic Distribution Groups — Listing the Azure dynamic distribution groups in the Azure tenant.   
 
 
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Select the dynamic distribution group whose members you want to view or modify. 
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Click Members. 
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In Members, set the type of recipients that will be members of the dynamic distribution group. 
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To apply your changes, click Save.