Sometimes in your organization, your users may require sending emails to the members of the Distribution Groups and want to hide their identity as a sender or they want the Distribution Group to be to be stamped as a sender of the mail.
You can do this from 3 different ways and I am going to share you those methods here. In case if you are Limited from access to ECP or exchange, you can try the 3rd method which might help you in solving these kinds of requests.
1. Exchange Admin Center
• To do this using ECP or Exchange Admin Center, Go to Recipients
• Go to Groups
• Search and select the Group on which you want to give Send-As permission to the users.
• Double Click on the Group to open the Properties/settings window as shown in the below screenshot.
• Go to Group Delegation
• In the Send As list, click on the Plus (+) button and add the users as shown below.
• Click Save
2. Exchange Management Shell
To do the same using the Shell, simply run the below Cmdlet
Add-RecipientPermission “Distribution Group” -AccessRights SendAs -Trustee “User Mailbox”
Change the Distribution Group to the Distribution Group Display name / SMTP address
And the User Mailbox to the User account/Mailbox Display Name or SMTP address of the users who need SendAs permission.
3. Active Directory
To Add SendAs Permission to the users from Active Directory, Login to one of your Domain Controller or the system where you have “Remote Administration tools” installed.
Go to Active Directory Users and Computers (Alternatively you can use Run command Dsa.Msc)
Some of the security settings in the AD are hidden by default to prevent unwanted/unintentional changes on the domain controller. To achieve our goal, we must turn on / enable these settings. To do so, in Active Directory Users and Computers, Click on View and then click on Advanced Features as shown below. Now you are all set to make the changes (Assuming that you have the required AD permissions).
Now, Search for the Distribution Group in ADUC and go to Properties.
Go to Security tab
Click on Add button which is below the Group or User Names list, and search for the user.
Now in the Security tab, by selecting the user you just added, go the Permissions for the users. Scroll down to Send As.
Click on the Allow Check box next to it. And Click Apply. And then Click OK.