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I know you can do it with Google Apps. Have not tried with Office365.

• itaifrenkel 10y ago
  After sleeping on it... I am not sure it would work with managers. They work with outside council on a day2day basis and they use attachments for that. I wonder why gmail hasn't made phishing attachments obsolete.
  • tarr11 10y ago
    If you just blocked zip files, it would be a good start.
    • mi100hael 10y ago
      Gmail does block quite a few attachment types. Zips are tricky because they're a very common way to send a collection of photos or docs or similar.