Some relevant points made by
@hawkeye
My outbound email isn't that professional...I use just my personal email (my Proton Mail). Could be a mistake on my part from a professional standpoint, but I pretty much feel that if someone has an interest in a domain that I am in possession of, they have the reassurance knowing that I'm a one man band, and I'm not some intimidating, big domain company looking to kill them on price / attempting to be something that I'm not. In my head, it adds some authenticity / personal feel to it with a personal email, dealing direct with the source, depending on how you look at it
My success rate is very low on outbound anyway. My last outbound a few weeks ago involved a fantasy quest card game, of which I own the "COM" (zero interest)