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On email, file types frequently used for malware to be blocked

Starting Monday, May 23, 2016, in order to better protect Cornell's community against malicious email attachments that often pose as something legitimate, the IT Security Office has requested that a list of file types most often used to deliver malware be blocked from Cornell’s email systems. This change aligns our systems with those of many of our peer institutions and industry best practices.

When a message with one of these attached file types is refused, Cornell’s email systems will attempt to notify the sender. A "message not delivered" message will be sent, but some systems outside of Cornell’s control (the sender’s email service provider or email application, for example) may interfere with delivery of this notification by classifying it as junk, spam, or for some other reason. Cornell's messaging system automatically replies to the sender when a message cannot be delivered, but the complexity of email ecosystems can sometimes block our efforts.

See a full list of the blocked file types.

Cornell Alternatives for Transferring Blocked File Types

The IT Service Desk will be prepared to support users with questions about this change. If you have any questions or concerns not addressed by using alternative options for transferring blocked file types, please send them to the IT Security Office.

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