Q&A: Why do suspicious zip files come through in Office 365?

Question About Suspicious Zip Files In Email

Today’s question is about suspicious zip file email attachments.

Question: We have a new commercial grade firewall installed but we have had a few suspicious zip files come in lately. Why is our web filter not preventing suspicious zip files from coming in through email?

Answer:  Those zip files are not coming in through the web per se, but rather through your email. Since you are on Office 365, your email is encrypted end-to-end.  The web firewall can’t inspect that data.  You can create an Office 365 email filter to filter out all zip file attachments system wide.  This will stop all zip files from coming through.  Your IT provider can help you set that up, and if not, we can.

We receive a lot of questions via email. When we can share helpful nuggets of generalized advice, we do.  You’re not likely to ever return to this blog so so get our small business IT tips directly in your inbox – subscribe to our monthly newsletter now. For personalized IT advice, contact us to schedule a an IT Audit & Assessment.  (416) 292-3300

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