Blocking Upload and Download of attachments from 3rd party webmail sites

We’d like to set up the blocking of upload AND download of all attachments from 3rd party webmail sites like Gmail, Outlook.com, Yahoo, etc… Effectively giving users the ability to receive and send emails through those services but that is all.

Does anyone have any experience with that? The default webmail rule blocks upload but not download so I assume we’d have to make a custom ruleset.

Thanks!

Tony

You can create file type control policy to block download from webmail url categories.