config.action_mailer.raise_delivery_errors = true
config.action_mailer.perform_deliveries = true

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

ActionMailer::Base.smtp_settings = {
  :address              => "smtp.gmail.com",
  :port                 => 587,
  :domain               => "mydomain.com",
  :user_name            => "info",
  :password             => "secret",
  :authentication       => "plain",
  :enable_starttls_auto => true
}

config.mailer_sender = "please-change-me-at-config-initializers-devise@example.com"

config.mailer_sender = "info@mydomain.com"

config.action_mailer.default_url_options = { :host => 'localhost:3000' }
ActionMailer::Base.smtp_settings = {
  :address              => "smtp.gmail.com",
  :port                 => 587,
  :domain               => "gmail.com",
  :user_name            => "myinfo@gmail.com",
  :password             => "secret",
  :authentication       => "plain"
  # :enable_starttls_auto => true # I don't have this, but it should work anyway
}

class UserMailer < ActionMailer::Base
  default :from => "myinfo@gmail.com"
  # ...
end