Or.... Their point is totally valid. There is no way reliable way to know who DOESN'T open your emails. You can get a list of who definitely opened your email AND said "OK to loading images and/or clicked on a link in…
Or.... Their point is totally valid. There is no way reliable way to know who DOESN'T open your emails. You can get a list of who definitely opened your email AND said "OK to loading images and/or clicked on a link in…