"Multiple add" Gives Internal Server Error When Adding Many Users
The UT Lists service has a limit to the number of users that can be added to a mailing list using the "Multiple add" feature. This limit is currently 500 users. If you are adding a large quantity of users above this limit, we suggest breaking up the users in to groups smaller than this limit.
If you are adding or updating lots of users on a regular basis, please reach out to the UT Lists team and we can see if there are other options to assist you in making changes. To contact us, please create a ticket in ServiceNow or send an email to firstname.lastname@example.org.