Do you have any issues with spam being sent to whatever_random_user@yourdomain.tld ? This concern has been my #1 reason for not doing the same setup. Basically

Do you have any issues with spam being sent to whatever_random_user@yourdomain.tld ? This concern has been my #1 reason for not doing the same setup. Basically a fear of a never-ending list of random addresses to blacklist, which won’t have any meaningful effect because the next spammer will just use a different random value.