rails--rails/actionmailer/CHANGELOG.md

• Mime type: allow to custom content type when setting body in headers and attachments.

  Example:

  def test_emails
    attachments["invoice.pdf"] = "This is test File content"
    mail(body: "Hello there", content_type: "text/html")
  end
  

  Minh Quy

• Exception handling: use rescue_from to handle exceptions raised by mailer actions, by message delivery, and by deferred delivery jobs.

  Jeremy Daer

Please check 5-0-stable for previous changes.