Hi! I use LeadJet with Hunter.io for email enrichment.
I assume LeadJet simply communicates the email domain that it sees on the LinkedIn profile page of the account a contact belongs to, in order to get back the simulated (or validated) email.
However, many companies have their LinkedIn page list their HR website (e.g. careers.pg.com) which results in a waste of a credit, work for the user (to go and fix it) and a not-so-seamless experience.
An idea would be to crowdsource user input here: Allow users to correct the email domain once, then use that correction moving forward (with some weighing of how many users input the same domain for validity).