先安裝及設定
http://redmineblog.com/articles/setup-redmine-to-send-email-using-gmail/
照最下面去改smtp_tls.rb
http://www.redmine.org/boards/2/topics/4833
測試
1. Login as an administrator
2. Go to the Administration panel
3. Go into the Settings and select the “Email notifications” tab
4. In the bottom right, click the link to “Send a test email”
update: 2012/06/08
1. 修改 configuration.yml
production:
  email_delivery:
    delivery_method: :smtp
    smtp_settings:
      tls: true
      enable_starttls_auto: true
      address: "smtp.gmail.com"
      port: 587
      domain: "example.com.tw" # 'your.domain.com' for GoogleApps
      authentication: :plain
      user_name: "redmine@example.com.tw"
      password: "example"
2. 修改 environment.rb
config.action_mailer.perform_deliveries = true
3. 重啟 redmine
收工 *菸*