MailDump Verifier - Powerful Emails Verifying Tool that helps verify email address or validate email addresses
Cold Email Hacks - Proven cold email templates and tactics for B2B startups
Mail Dump - Powerful Extensions for email addresses extracting, verifying and finding
Cold Email Analyzer by Mailshake - Real-time analysis of email subject lines and copy
Hunter - Find all the email addresses related to a domain
Mailshake - Mailshake lets you build your professional network through a smart and intuitive approach to cold emailing.