There are a lot of services that "guess" valid email addresses for a given business contact. (Think: I have a B2B decision maker's LinkedIn contact info, and I

There are a lot of services that "guess" valid email addresses for a given business contact. (Think: I have a B2B decision maker's LinkedIn contact info, and I want to cold-email them. What could be their email address?) Think Kitt AI or Rocket Reach. There are also "email validators" that check if your email list is still good.