Need some help

[Harry29]

Hi everyone!
I've been trying to reach out to publishers for a comic book project, but I've noticed a strange thing – I'm getting very few responses. I discussed this with a friend, and he mentioned something about email "bounce rate," suggesting it might be why my emails aren't getting through. Honestly, I'm not too familiar with this term. Can anyone explain what is this and how it might affect email deliverability? I'm really looking to understanding the Bounce Rate Better to improve my chances of getting responses. Thanks in advance!