What file types are blocked and cannot be uploaded or sent as attachments?

September 14, 2017

In order to protect users from malicious software, the Information Security team maintains mail security filters to block potentially dangerous executable file types from reaching University mailboxes. We recognize that this may cause some disruption for email users, however we feel that the risk outweighs the end-user impact. 

As well, Microsoft Office365 automatically blocks a number of file types automatically. Additional information on those extensions and advice on how to share files securely can be found here - https://support.microsoft.com/en-us/office/blocked-attachments-in-outlook-434752e1-02d3-4e90-9124-8b81e49a8519 

Please note that if a file is blocked, the email will still be delivered and that attachment replaced with a text file with the following message "Dangerous file types are blocked for your protection. For any additional questions, please contact the administrator." If the file is required, please contact the CCS Help Centre for assistance (519) 824-4120 x58888 or 58888help@uoguelph.ca. 

Blocked Attachment File Types