Is it already possible to modify X-Header's when Sending Email through the Proxy? I am using an internal Email-Server which always adds an entry to every email which allows to identify the Software, Version and even through a unique number the installation. That could help attackers to to collect some information what I don't like. So I want to remove or modify this X-Mailer Header and the proxy seems to be ideal for that. MAybe that could be iplemented or is there already a way to remove Headers of your choice?
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