root@observium01:~# cat /var/lib/sendmail/dead.letter
From MAILER-DAEMON Wed Mar  1 09:24:46 2017
Return-Path: <MAILER-DAEMON>
Received: from localhost (localhost)
        by observium.example.domain.com (8.14.4/8.14.4/Submit) id v21GOkEg020365;
        Wed, 1 Mar 2017 09:24:46 -0700
Date: Wed, 1 Mar 2017 09:24:46 -0700
From: Mail Delivery Subsystem <MAILER-DAEMON>
Message-Id: <201703011624.v21GOkEg020365@observium.example.domain.com>
To: username_lol
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
        boundary="v21GOkEg020365.1488385486/observium.example.domain.com"
Subject: Returned mail: see transcript for details
Auto-Submitted: auto-generated (failure)

This is a MIME-encapsulated message

--v21GOkEg020365.1488385486/observium.example.domain.com

The original message was received at Wed, 1 Mar 2017 09:24:46 -0700
from root@localhost

   ----- The following addresses had permanent fatal errors -----
285
    (reason: 550 5.1.1 <285@observium.example.domain.com>... User unknown)
    (expanded from: 285)

   ----- Transcript of session follows -----
... while talking to [127.0.0.1]:
>>> DATA
<<< 550 5.1.1 <285@observium.example.domain.com>... User unknown
550 5.1.1 285... User unknown

--v21GOkEg020365.1488385486/observium.example.domain.com
Content-Type: message/delivery-status

Reporting-MTA: dns; observium.example.domain.com
Arrival-Date: Wed, 1 Mar 2017 09:24:46 -0700

Final-Recipient: RFC822; 285@observium.example.domain.com
Action: failed
Status: 5.1.1
Remote-MTA: DNS; [127.0.0.1]
Diagnostic-Code: SMTP; 550 5.1.1 <285@observium.example.domain.com>... User unknown
Last-Attempt-Date: Wed, 1 Mar 2017 09:24:46 -0700

--v21GOkEg020365.1488385486/observium.example.domain.com
Content-Type: text/rfc822-headers

Return-Path: <username_lol>
Received: (from root@localhost)
        by observium.example.domain.com (8.14.4/8.14.4/Submit) id v21GOkEf020365;
        Wed, 1 Mar 2017 09:24:46 -0700
To: username_lol@domain.example.com
Subject: SYSLOG: [al03.02.mdf01.phx02.0x002.io] ETHPORT-5-IF
X-PHP-Originating-Script: 0:mail.php
MIME-Version: 1.0
Content-Type: multipart/alternative;
 boundary="=_83ec001fd8e767f86f57a86b9ebc3d09"
From: "Observium" <observium@observium.example.domain.com>
Message-ID: <1024b6a7ad41b8ad054ab380d2d0f0df@observium.example.domain.com>
Date: Wed, 01 Mar 2017 09:24:46 -0700
X-Priority: 3
X-Mailer: Observium 17.2.8356
Precedence: bulk
Auto-submitted: auto-generated
X-Auto-Response-Suppress: All

--v21GOkEg020365.1488385486/observium.example.domain.com--


From MAILER-DAEMON Wed Mar  1 09:24:47 2017
Return-Path: <MAILER-DAEMON>
Received: from localhost (localhost)
        by observium.example.domain.com (8.14.4/8.14.4/Submit) id v21GOlH2020396;
        Wed, 1 Mar 2017 09:24:47 -0700
Date: Wed, 1 Mar 2017 09:24:47 -0700
From: Mail Delivery Subsystem <MAILER-DAEMON>
Message-Id: <201703011624.v21GOlH2020396@observium.example.domain.com>
To: username_lol
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
        boundary="v21GOlH2020396.1488385487/observium.example.domain.com"
Subject: Returned mail: see transcript for details
Auto-Submitted: auto-generated (failure)

This is a MIME-encapsulated message

--v21GOlH2020396.1488385487/observium.example.domain.com

The original message was received at Wed, 1 Mar 2017 09:24:47 -0700
from root@localhost

   ----- The following addresses had permanent fatal errors -----
285
    (reason: 550 5.1.1 <285@observium.example.domain.com>... User unknown)
    (expanded from: 285)

   ----- Transcript of session follows -----
... while talking to [127.0.0.1]:
>>> DATA
<<< 550 5.1.1 <285@observium.example.domain.com>... User unknown
550 5.1.1 285... User unknown

--v21GOlH2020396.1488385487/observium.example.domain.com
Content-Type: message/delivery-status

Reporting-MTA: dns; observium.example.domain.com
Arrival-Date: Wed, 1 Mar 2017 09:24:47 -0700

Final-Recipient: RFC822; 285@observium.example.domain.com
Action: failed
Status: 5.1.1
Remote-MTA: DNS; [127.0.0.1]
Diagnostic-Code: SMTP; 550 5.1.1 <285@observium.example.domain.com>... User unknown
Last-Attempt-Date: Wed, 1 Mar 2017 09:24:47 -0700

--v21GOlH2020396.1488385487/observium.example.domain.com
Content-Type: text/rfc822-headers

Return-Path: <username_lol>
Received: (from root@localhost)
        by observium.example.domain.com (8.14.4/8.14.4/Submit) id v21GOlH1020396;
        Wed, 1 Mar 2017 09:24:47 -0700
To: username_lol@domain.example.com
Subject: SYSLOG: [al03.02.mdf01.phx02.0x002.io] VSHD-5-VSHD
X-PHP-Originating-Script: 0:mail.php
MIME-Version: 1.0
Content-Type: multipart/alternative;
 boundary="=_bc426c20f2d68b9fa861af4da48610c7"
From: "Observium" <observium@observium.example.domain.com>
Message-ID: <a9268b00179cfc7ec67e98d784f35ff5@observium.example.domain.com>
Date: Wed, 01 Mar 2017 09:24:47 -0700
X-Priority: 3
X-Mailer: Observium 17.2.8356
Precedence: bulk
Auto-submitted: auto-generated
X-Auto-Response-Suppress: All

--v21GOlH2020396.1488385487/observium.example.domain.com--