What are some alternatives?
When comparing mails.wtf and Hunter, you can also consider the following products
LeadGibbon - Access millions of business contacts, with verified email addresses and phone numbers
Lusha - Find Professional Contact Information on. Social Networks. Lusha's Chrome extension automatically scans the profile page you are visiting and provides additional, valuable contact information. LEARN MORE.
Mail Dump - Powerful Extensions for email addresses extracting, verifying and finding
Clearbit - Clearbit provides Business Intelligence APIs
Snovio - With Snovio you can find emails, verify them and run your email campaigns within minutes.
Find That Email - The yellow pages of emails.