MTA on host os

Do i need this MTA thing ? I now have exim4 running. I read that it’s needed to deliver error messages, but not sure what kind of error messages. I want to remove as much services as possible. Can i remove it from my host os without facing later problems?

I personally never felt need for it. All depends on you. Also as per https://www.whonix.org/wiki/About#Based_on_Debian.

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