#gem install mail require 'rubygems' require 'mail' smtp_settings = { :address => "XXXXXXXX.com.root.local", :port => 25, } Mail.defaults do delivery_method :smtp, smtp_settings end mail = Mail.new mail.charset = 'ISO-2022-JP' mail.from = "foo@example.com" mail.to = 'aaa@hoge.com' mail.subject = 'aaa' mail.body = 'aaa' mail.deliver