IDE 插件
Writing Mailers
Write ActionMailer classes, mailer templates, and previews following DHH/37signals conventions — thin mailers, parameterized Mailer.with, deliver_later, multipart HTML/text, I18n for subjects, and previews for development. Use when creating or changing mailers, mailer views, email copy, or mailer specs; not for SMTP provider setup or Action Mailbox inbound mail.