Back when I was trying to break into comics as a writer, I submitted several pitches. This was back in the day before the Big Two (that’s Marvel and DC for those who don’t know) closed down their slushpiles. I got very nice rejection letters from DC and I have them around here somewhere. One from another smaller publisher even offered some feedback that was very helpful.
I had a relationship with one small publisher and one editor (each at different places) and got very nice emails that were terribly encouraging though both passed on the projects. I was encouraged. I should give them credit for me still wanting to be creative even though I had put my heart and soul into the projects I submitted. They told me I was good enough but the stories weren’t what they published. Sigh.