We have a lot of users of our product who sign up with team email aliases. Some higher-ups at big enterprises are on multiple distribution lists and so when we send out an email, they get multiple copies. I've been asked to investigate if there is any way to automatically identify these distribution lists so we can not subscribe them to emails. I can't think of any way (they're not going to follow an easy structure like marketing@ or sales@, we're talking about big orgs with lots of divisions). Any ideas, Marketing Nation?