[ZIMBRA] Prevent User Customizing “FROM” header

Background

Some of our Zimbra customers are complaining for authenticated user can customizing FROM header which can lead to fraud email. this issue can be reproduce by using thunderbird once compose an email as following picture.

customize_from_header.png

or by using this script, change variables username, password, fake_from and to_addr based on your environment.

Solution

I created customized milter engine using python milter library for my workaroud with following features:

Continue reading “[ZIMBRA] Prevent User Customizing “FROM” header”

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