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How to remove the Welcome Message when a new member joins a group.
We are moving from an on-premise Exchange 2013 environment (using Hybrid) and we have to move our DLs to the cloud. I can create them through powershell as a distribution group, but that does not wr...
You can use the following command to suppress the welcome message for any new users added to the group as a member. The default value will be set to true for this parameter. So you will need to pass "false" as the value to suppress the welcome message.
Set-UnifiedGroup <groupname> -UnifiedGroupWelcomeMessageEnabled:$<true/false>
I just found this thread because the same thing just happened to me. I created a dynamic group in Azure this morning containing all employees -- for ADMINISTRATIVE PURPOSES -- and a few hours later it emailed friggin' all 1850 group members about it. I can't for the life of me understand why Microsoft would think this is a smart thing to do. I could see if this were a group created by a standard user who added a few of their colleagues to it, but when a system admin goes in and creates a group like this...DON'T EMAIL EVERYONE!! 
