EmailSearch.io is a simple tool that allows users to search for email addresses based on domain, LinkedIn profile, or company.
They have have a CSV upload and API solution for bulk email searches. Upload your document and have it enriched with contact data in no time!
Nymeria's browser extension enables you to find personal and professional email leads with the click of a button.
It has a nice add-on feature which brings up emails when browsing within LinkedIn. Very handy for recruiters!