Rails mailer previews not available from spec/mailers/previews

For me, the solution was to move everything inside

myapp/test/mailers/previews/

myapp/spec/mailers/previews/

After doing so, the mailer previews were accessible at the usual URL:

http://localhost:3000/rails/mailers

I found this information here

Use

config.action_mailer.preview_path = "#{Rails.root}/spec/mailers/previews"

in config/environments/development.rb to define the path where previews are located.

Since you're using RSpec, it's expected that you use the spec folder.

It that's the case, I'd rather move your file to spec/mailers/previews/user_mailer_preview.rb

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