Zip Files Blocked when sent to PantherLists
For example, a .zip file with a bunch of Word documents sent to a PantherList will be blocked.
Office 365 currently blocks .zip files that contain .exe, .pif, or .scr files. However, if a zip file sent to a PantherList, then the entire .zip file will be blocked regardless of whether or not it contains an .exe, .pif, or .scr file.
Someone wishing to send .zip files that do not contain .exe, .pif, or .scr files should send to individual addresses only. A person could use an Office 365 Contact Group as an alternative to PantherList. To learn how to create a contact group, read the following document - https://kb.uwm.edu/page.php?id=31474
The following document provides information regarding UWM's policies with email attachments - https://www4.uwm.edu/itsecurity/news/news/email-attachment-restrictions-in-office-365.cfm