Redmine 설치폴더\apps\redmine\htdocs\config\configuration.yml 파일을 건드려야 한다. # default configuration options for all environments default: # Outgoing emails configuration # See the examples below and the Rails guide for more configuration options: # http://guides.rubyonrails.org/action_mailer_basics.html#action-mailer-configuration email_delivery: delivery_method: :smtp smtp_settings: enable_starttls_..