Outlook blocks the sending and receiving of certain types of files to protect you and your recipients from computer viruses. To find the full list of blocked attachment types, follow the link below.

Note: If you're using a Microsoft Exchange account, your email server administrator can unblock certain file types. Contact your administrator for more assistance.

Blocked Attachments in Outlook Mobile and Outlook for Mac

Need more help?

Want more options?

Explore subscription benefits, browse training courses, learn how to secure your device, and more.

Communities help you ask and answer questions, give feedback, and hear from experts with rich knowledge.