Distribution list is a handy way to get a group email to an In e-mail applications, a distribution list is a group of mail recipients that is addressed as a single recipient. Distribution lists are used to send e-mail to groups of people without having to enter each recipient's individual address. A distribution list is different from an e-mail list in that members cannot reply to the distribution list's name to send messages to everyone else in the group.
But in Exchange cloud has an option to sent email to distribution list from out side the group as well.
Lets see how we can create it.
First of all login to you office portal @ https://admin.microsoft.com/
Then go to your admin page and click Groups
Click + Add a Group
Click Type and select Distribution list.
Give the name of your distribution list and email address. You can notice at the bottom it says Allow people outside of my organisation to send email to this distribution list.
Should you wish to receive mail click this and make it on.
Thats all we have now created a distribution list and it will take some time to appear in your group list.
Once the list is in the groups we will go and add users to our distribution list.
In exchange we can't add users from external domain to distribution list, so the option for us to do this is, Create the external users as contact in the exchange contact and then we can add them to the distribution list.
Create Contact in Exchange server
Create new contact
Now go back to Groups and click the newly created Distribution list and add the users under the members
Click Edit and search the newly created contact and add them all in to the group.
Thats all , we are now ready to receive email to the listed users using distribution list.
Thanks