You will not be allowed to attach any of these 104 file types into an email using Microsoft Outlook. Microsoft cites that blocking the sending and receiving of these types of files helps protect against computer viruses.

One of the most common ways of transmitting computer viruses is through file attachments that have malware embedded in them. Downloading one of these 104 file types would expose recipients to malware, that evades existing cybersecurity defenses.  

Figure 1: A list of most, but not all, blocked attachments in Outlook

Productivity at The Expense of Security

Completely blocking the flow of these file extensions may ensure security, but also disrupts business productivity and workflow. Some of the blocked file types are used as productive tools that include macros, commonly used in spreadsheets and javascript, commonly used in pdf documents. Blocking the files will limit business flow and workplace productivity.

Microsoft suggests alternative ways of sending & receiving a blocked attachment file, which includes: (i) saving the file to the cloud and send a link to the file (ii) use a file compression utility like WinZip or (iii) rename the file with another extension, then change the name back to the original name after the file is received.

Complicating the file sharing process with above alternative methods will inevitably expose a business to threats embedded within files as employees will take shortcuts to sending and receiving potentially malicious files.

With CDR You Don’t Have to Choose Between Security & Productivity

Content Disarm and Reconstruct (CDR) technology completely eliminates the possibility of a breach caused by malware hidden in files. The technology does this by disarming all code in a file that could be a potential threat. CDR therefore eliminates the need for humans to ever interact with malicious files, thereby eliminating the risk involved with sending and receiving potentially malicious file attachments.

CyberQuay’s next-gen CDR offers enterprises enhanced security, quick processing time and productivity with first in class features. The superior productivity element and flexibility is what really sets next-gen CDR apart from traditional versions of CDR technologies. Learn more about CyberQuay’s solution here.