From user@testserver
From: Mail Delivery System <postmaster-dsn@testserver>
To: <user@testserver>
Subject: Mail delivery failed: returning message to sender
Message-ID: *
Date: *
In-Reply-To: <booooo>
References: <booooo>
X-Failed-Recipients: fail@testserver, 
Auto-Submitted: auto-replied
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
    boundary="???????????"


--???????????
Content-Type: text/plain; charset="utf-8"
Content-Disposition: inline
Content-Description: Notification
Content-Transfer-Encoding: 8bit

Delivery of your message to the following recipient(s) failed permanently:

  - fail@testserver


Technical details:
- "false" (PIPE) failed permanently with error:
    exit status 1


--???????????
Content-Type: message/global-delivery-status
Content-Description: Delivery Report
Content-Transfer-Encoding: 8bit

Reporting-MTA: dns; testserver

Original-Recipient: utf-8; fail@testserver
Final-Recipient: utf-8; false
Action: failed
Status: 5.0.0
Diagnostic-Code: smtp; exit status 1



--???????????
Content-Type: message/rfc822
Content-Description: Undelivered Message
Content-Transfer-Encoding: 8bit

Received: from localhost
	by testserver (chasquid) with ESMTPSA
	tls *
	(over *
	; *
Date: *
From: Mailer daemon <somewhere@báratro>
Subject: I've come to haunt you
Message-Id: <booooo>

Ñañañañaña!




--???????????--