Message Size Limitations in UT Lists
The total size of your message cannot exceed 5 megabytes (MB), including attachments and ASCII encoding.
This limit conserves mailbox storage resources as messages are delivered to individual subscriber mailboxes. Each subscriber's copy of a message contributes to overall resource consumption within the mailbox service they use. This can add up quickly for mailing lists with hundreds or even thousands of subscribers.
Please contact the ITS Service Desk for assistance if there is a business reason for routinely sending messages larger than this limit to a UT Lists mailing list.