Mailgun is a set of APIs that allow you to send, receive, track and store email effortlessly.
https://www.mailgun.com/
Email Hosting Providers · Transactional Email
Get access to data on 1,536,028 websites that are Mailgun Customers. We know of 1,002,726 live websites using Mailgun and an additional 533,302 sites that used Mailgun historically and 629,562 websites in the United States.
Get a list of 1,536,028 websites using Mailgun which includes location information, hosting data, contact details, 1,002,726 currently live websites and an additional 1,352,321 domains that redirect to sites in this list. 533,302 sites that used this technology previouslyand 629,562 websites in the United States currently using Mailgun.
Countries
Financial
Group
Region
These are sites that we think might use Mailgun in the future because of their similarity to other sites that already do.