--- !ruby/hash:ActiveSupport::HashWithIndifferentAccess
from: MAILER-DAEMON@example.com (Mail Delivery System)
from_email: MAILER-DAEMON@example.com
from_display_name: Mail Delivery System
to: you@example.com
subject: Undelivered Mail Returned to Sender
body: 'some test

  '
content_type: text/plain
attachments: []