REDMINE :set gmail as smtp

1. Install the action_mailer_optional_tls plugin
ruby script/plugin install git://github.com/collectiveidea/action_mailer_optional_tls.git
id failed, go to the http://github.com/collectiveidea/action_mailer_optional_tls
then download source  Just extract it to vendor/plugins/action_mailer_optional_tls.

2. Configure your email.yml
A complete file that uses GMail for development and production would look like:

# File: config/email.yml
production:
  delivery_method: :smtp
  smtp_settings:
    tls: true
    address: "smtp.gmail.com"
    port: '587'
    domain: "smtp.gmail.com"
    authentication: :plain
    user_name: "your_email@gmail.com"
    password: "your_password"

development:
  delivery_method: :smtp
  smtp_settings:
    tls: true
    address: "smtp.gmail.com"
    port: '587'
    domain: "smtp.gmail.com"
    authentication: :plain
    user_name: "your_email@gmail.com"
    password: "your_password"

test:
  delivery_method: :test