I can't find it now, but there was a mildly populae HN thread about a service that does "email validation" and part of it did catch-all detection, and there do

I can't find it now, but there was a mildly populae HN thread about a service that does "email validation" and part of it did catch-all detection, and there do seem to be other services that market this[0]. 0: https://www.email-validator.net/blog/validating-catch-all-emails/ https://www.email-validator.net/blog/validating-catch-all-em... (warning: annoying marketing page)