Letter Opener Web

Every mailer you write needs looking at before it goes out. This mounts the outbox.

What you get

• A browsable list of the emails your app has "sent"
• HTML, text and raw source views of each one
• Attachment previews
• A delete-all button

Mounting it

# Gemfile
group :development do
  gem "letter_opener_web"
end

# config/routes.rb
mount LetterOpenerWeb::Engine, at: "/letter_opener" if Rails.env.development?

On staging too

Mounting it on staging behind an admin check is the trick that removes the SMTP
sandbox subscription entirely: the team reads staging mail at a path on the staging
app.