Hello, @danny,
This seems to be your server-side issue, Can you please once read and follow the instructions written in this article, one by one: https://www.cloudways.com/blog/woocommerce-not-sending-emails/ hope this will helps, and if not then please once try to check it with activating the default WordPress theme like Twenty Twenty Two, just to make it sure that the issue is with our theme or not?
Regards 8Themes Team.