Rails now allows EML files to be downloaded from the email preview | Saeloun Blog

To test emails in Rails, ActionMailer::Preview provides an easy way to preview emails in the browser. This feature is very useful for developers to test emails in the browser. However, to get a real sense of how an email will look in the inbox, it is necessary to download the email as an .eml file and open it in an email client. This was only possible by sending the email to a real email address (or using a service like MailCatcher, MailDev etc.) and downloading it from the inbox. This is not a very convenient way to test emails.