--- !ruby/hash:ActiveSupport::HashWithIndifferentAccess
from: MAILER-DAEMON <postmaster@example.com> (Mail Delivery System)
from_email: postmaster@example.com
from_display_name: MAILER-DAEMON
to: receiver@example.org
subject: Undelivered Mail Returned to Sender
body: |
  This is the mail system at Centrum Holdings

  I'm sorry to have to inform you that your message could not
  be delivered to one or more recipients. It's attached below.

  For further assistance, please contact your system administrator.

  If you do so, please include this problem report. You can
  delete your own text from the attached returned message.

                     The mail system
content_type: text/plain
attachments:
- !ruby/hash:ActiveSupport::HashWithIndifferentAccess
  data: |
    Reporting-MTA: dns; mail.example.com
    X-Postfix-Queue-ID: 242788039D8C
    X-Postfix-Sender: rfc822; receiver@example.org
    Arrival-Date: Wed, 22 Jul 2020 13:43:06 +0200 (CEST)

    Final-Recipient: rfc822; receiver@example.org
    Action: failed
    Status: 5.2.2
    Diagnostic-Code: X-Postfix; Mailbox is full
  filename: Delivery report.txt
  preferences: !ruby/hash:ActiveSupport::HashWithIndifferentAccess
    Content-Type: message/delivery-status
    Content-Description: Delivery report
    Mime-Type: message/delivery-status
    Charset: UTF-8
- !ruby/hash:ActiveSupport::HashWithIndifferentAccess
  data: ''
  filename: Undelivered Message.eml
  preferences: !ruby/hash:ActiveSupport::HashWithIndifferentAccess
    Content-Type: message/rfc822
    Content-Description: Undelivered Message
    Mime-Type: message/rfc822
    Charset: UTF-8