Our developer Yauheni drastically refactored all the mailing system code with the new Rails 5.1 features. We made him to share the story in a new article in the series ‘Development of mkdev’. Read it to find out how to make mailers in Rails simpler, smaller and more flexible.

https://mkdev.me/en/posts/thin-and-maintainable-rails-mailers-how-we-refactored-rails-mailers-at-mkdev