See my blog post for description and installation. https://iomarmochtar.wordpress.com/2017/09/13/zimbra-prevent-user-customizing-from-header/
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View Code? Open in Web Editor NEWThis is my workaround for zimbra's postfix issue for preventing authenticated user can modify FROM: in email address
Home Page: https://iomarmochtar.wordpress.com/2017/09/13/zimbra-prevent-user-customizing-from-header/
License: GNU General Public License v2.0