RubyでGmailを送信する基礎 - Qiita

require 'mail' from = 'my_gmail_address@gmail.com' password = '16_digit_app_password' to = 'to_address@gmail.com' Mail.defaults do delivery_method :smtp, { address: 'smtp.gmail.com', port: 587, domain: 'example.com', user_name: from, password: password, authentication: :login, enable_starttls_auto: true } end m = Mail.new do from "#{from}" to "#{to}" subject "Great Mail Title" body "Fantastic body