Apps similar to Mailpit include Postfix, which is free and open source. Other options are MailGrab, Gmailnator (Emailnator), MailHog and Mailcatch.app. There's no shortage of Mail Servers like Mailpit, with more than 25 alternatives for the web, Mac, Linux, Windows and self-hosting.
Sendpit is a hosted email testing sandbox designed for developers and QA teams. It allows applications to send emails to a safe inbox where messages can be inspected, debugged, and tested without being delivered to real users.
India
Imitate Email is a fake SMTP server for developers and testers. It includes an embeddable widget so that testers can quickly see sent emails alongside the app they're testing.
United Kingdom
