Do you email aliases? There are many ways to do this. Almost every email provider offers this service. Some domain registrar offer it for free as well, like porkbun.
I guess it depends on the domain registrar and the hosting which option is easiest. Also important; do you want to automate it or just do it manually?
Hey, sorry I couldn't sign in before. I'm going to try mailgun as per Marc's suggestion. I will make it manual to start off with. I'm with namecheap.