Bens Blog

While migrating a Ruby on Rails application to a new server I found my application throwing an unitialized ActionMailer error on server start.

./script/../config/../config/environment.rb:29:NameError

uninitialized constant ActionMailer

I thought this was strange – as the ActionMailer gem was installed fine.

The original system was running fcgi through Apache and on this server I was using Mongrel server.

I found a solution here:

http://highearthorbit.com/uninitialized-constant-actionmailer/

Turns out the ActionMailer server settings need to be outside the block

Rails::Initializer.run do |config|

..it fixed the problem for me.