Show HN: Better Mailer Previews, a gem for better ActionMailer/email previews

hey HN! I use the mailer previews built into Ruby on Rails extensively, but they're pretty lacking (learn more: https://guides.rubyonrails.org/action_mailer_basics.html#pre...).

I've had the idea for a better version in my head for a while, and over the weekend I found the time to throw it together! The advantage of this gem/engine is that you can live preview your mailers on the index route, test their responsiveness easily, and forward them on to another email.

Let me know what you think! The GitHub README has a bunch more info + a handy GIF, and I've also tweeted about it (https://twitter.com/hrrsnbbnt/status/1731588511533519188) if that's more your thing.

Thanks! -harrison