> Assuming I get four such emails per week and that it takes two minutes to read and respond to each one, automating this would save me about seven hours of administrative work per year.

Am I the only one thinking that it's obviously not how it works? Not even considering the time it took implementing that.

I mean it's a fun project, but I don't see the need to justify it with "it will make me more productive".

Fun is reason enough.