MailCatcher is a simple tool that catches and displays any emails sent to it. Running as a super simple SMTP server, MailCatcher allows you to view messages in a web interface by setting your app to deliver to smtp://127.0.0.1:1025. It stores all mail for display, showing HTML, Plain Text, and Source versions of messages, as applicable. MailCatcher rewites HTML to display embedded images and opens links in a new window. With keyboard navigation, it offers unique features like downloading attachments separately. Although basic, MailCatcher has a fairly RESTful API and supports JSON message downloads. Donations support its development by Samuel Cochran.
https://mailcatcher.me/