One of the best tool (from a usability perspective) to find anyone’s email address, as this tool tells you how each email was found.
Additionally, Emailchaser lets you try their email finder tool for free without needing to sign up for an account. This is much easier compared to other tools that require you to first sign up.
The tool also includes a “Bulk Email Finder”, which allows you to upload a .csv file with your prospects’ names and domains, and it will find all of their email addresses at once.