Rails3 mailer with image_tag ignoring host

I've got a Rails3 mailer layout that include images.

This ones are used like :

image_tag("emails/top.gif", :width => "700", :height => "10", :alt => "")

As of Rails 2, this images included the host and produced the expected result. However, since Rails3 the config.action_mailer.default_url_options seems to be ignored.

Is the开发者_JAVA百科re anything I'm missing?

Update

my config/environment/development.rb include:

config.action_mailer.default_url_options = { :host => 'mydomain.tld' }

---

Needs to use config.action_mailer.asset_host = 'http://mysite.com' in your environment config file

Credits: wmoxam in #rubyonrails