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The Office 365 system caps individual email recipients at 500, regardless of user. This is an Office 365 limitation and not a UCCS limitation.
However, with the new Office 365 email system, you can create your own lists - termed 'distribution groups' in Office365, which allows you to add more than 500 recipients to an email.

Step 1: Log into the Outlook Web App (OWA)

Log into the Outlook Web App (OWA) by going to

Step 2: Click Settings Icon

Once you login, click the 'Settings' gear icon in the upper-right corner of the page.

Step 3: Select Mail

In the 'Settings' menu click the 'Mail' option towards to the bottom of the list.

Step 4: Select General

Once the Mail settings page loads, click the General menu option to expand the options.

Step 5: Select Distribution Groups

Click the Distribution Groups option under the General options.

Step 6: Create Distribution Group

Under 'Distribution groups I own' click the '+' button to make a new group.

Step 7: Add Users

The following window will allow you to name the group, add owners, and add members.
Any item with an asterisk * by it is required to be filled out before you can save the Distribution Group.

Groups I Belong To vs Groups I Own

If you are a member of a distribution group it will appear under Distribution groups I belong to.
If you are an owner of the group the list will appear under Distribution groups I own.
It is possible to be both the owner and member of a Distribution group.


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