To confront or not to confront colleague

[bunnymum]

Hi, just wondering if there's any HR experts here or hubbers with people management experience? I want to know how I should politely confront a colleague that I heard through another colleague that he/she has been talking/criticising behind my back? or is it better to bring this up to a manager?

I have a colleague who has viewed my work activities behind my back as our team allows a shared email inbox amongst several people including myself. Due to the nature of my job, my work allows several people access to a shared inbox so there is no such thing as a 'privacy' especially when there's an email addressed to me.

Today i received an email from my manager to that shared inbox with instructions and feedback about my recent project which needed some improvements, etc (very factual, logical feedback and i accepted it - nothing wrong with it actually). However one colleague unfortunately had a chance to take a look that email and took this opportunity to criticise about my work which he spoke to another colleague about. Those criticisms weren't even the true series of events, and there were false conclusions (lots of assumptions)

Upon hearing that, i really wanted to respond to him, to give a new perspective. I spoke my other colleague whom I heard about this incident from and she didn't mind me going up to him and tell him that I've heard from her. I am confident my female colleague wasn't lying and this male colleague's criticism was derived from this feedback email and it wasn't a made up criticism, but i disliked his criticism and false conclusions which it felt like it had damaged my reputation.

What is the acceptable way of 'confronting' him? I will lose nothing, but not sure if i'll gain anything. Because if you confront someone they'll normally deny anyway?