Enter a person's name and their company's domain and this tool lists the email formats companies commonly use, such as first.last@ and flast@, and checks that the domain takes email. The formats are guesses, not confirmed addresses.
The tool takes the first and last name, tidies them (lower case, accents and apostrophes removed, spaces and hyphens joined up) and builds the formats that companies commonly use: first, last, first.last, first_last, flast, f.last, firstl and their reverses.
The list is in a fixed order. It is not ranked, because no reliable public data says which format is most common, and the right one depends entirely on the company.
At most one of these is real, and often none is. A company may use a nickname, a number, a different order, or a format of its own. The domain check only tells you that the domain takes email, not that any one mailbox exists.
The best way to find the format a company uses is to look at an address it has published for someone else, in a press release, a contact page or a conference listing, and apply the same pattern.
Do not send to every guess. The wrong ones bounce, and bounces hurt the domain you send from. Run the likely one through the email validator, and verify it before a real send. Warmerly's email finder and email verification do that step for you and score how sure they are.
An address inferred from a pattern is personal data about that person. The rules on contacting someone without being asked differ by country and by who they are, so this page cannot tell you what is allowed. In general, expect to need a lawful basis, to say who you are, and to give a working way to opt out in every message.
Warmerly's email finder resolves a name and a company and verifies every result, with a confidence score so you can set your own threshold.