OSTicket - example bounced mail

Delivery has failed to these recipients or groups:

mailgroup@domain.com<mailto:mailgroup@domain.com>
Your message can't be delivered because delivery to this address is restricted.

Diagnostic information for administrators:

Generating server: DOMAIN.COM

mailgroup@domain.com
#550 5.7.1 RESOLVER.RST.AuthRequired; authentication required ##rfc822;mailgroup@domain.com

Original message headers:

Received: from mail6.sub.domain.com (10.20.10.205) by MAIL.DOMAIN.COM
 (10.20.10.15) with Microsoft SMTP Server (TLS) id 14.3.224.2; Wed, 24 Jun
 2015 09:55:03 +0200
Return-Path: <support@domain2.com>
Received: from [11.111.111.11] by server-6.sub.domain.com id
 2F/FF-13517-7526A855; Wed, 24 Jun 2015 07:55:03 +0000
X-Env-Sender: support@domain2.com
X-Msg-Ref: server-14.sub2.domain.com!1435132502!31948374!1
X-Originating-IP: [88.88.88.8]
X-SpamReason: No, hits=0.0 required=7.0 tests=sa_preprocessor:
  VHJ1c3RlZCBJUDogODEuMjQuNjMuOSA9PiA3NTAx\n
X-StarScan-Received:
X-StarScan-Version: 6.13.16; banners=-,-,domain.com
X-VirusChecked: Checked
Received: (qmail 24233 invoked from network); 24 Jun 2015 07:55:02 -0000
Received: from mailwash-002-01.domain3.com (HELO mailwash-002.domain3.com) (88.88.88.8)
  by server-14.sub2.domain.com with DHE-RSA-AES256-SHA encrypted
 SMTP; 24 Jun 2015 07:55:02 -0000
X-Virus-Scanned: Debian amavisd-new at mailwash-002
Received: from mail.domain4.com (exf2.domain4.com [83.219.92.22])   by
 mailwash-002.domain3.com (8.14.3/8.14.3/Debian-9.4) with ESMTP id t5O7sr4b005137
        (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=NO)      for
 <mailgroup@domain.com>; Wed, 24 Jun 2015 09:55:02 +0200
Received: from localhost (22.22.22.22) by mail.domain4.com (83.219.92.22)
 with Microsoft SMTP Server id 14.3.224.2; Wed, 24 Jun 2015 09:54:18 +0200
Content-Type: multipart/alternative;
        boundary="=_6e9a6699476798e0ca676808598f4a2c"
MIME-Version: 1.0
From: Company support <support@domain2.com>
To: Company XYZ <mailgroup@domain.com>
Subject: Re: Issue XYZ [#480352]
Date: Wed, 24 Jun 2015 09:52:47 +0200
Message-ID: <A7a4Rx4-TFxaeuu1N-JwAAAFECAABD-@7b7ea1914b>
X-Mailer: osTicket Mailer
In-Reply-To: <3918A57FF6F7314DB5D704FF1317CC73710A27E0@MAIL.DOMAIN.COM>
References: <A7a4Rx4-0gEuaotzu-JAAAADICAABV-@4c9f164190>
 <3918A57FF6F7314DB5D704FF1317CC73710A23A3@MAIL.DOMAIN.COM>
 <A7a4Rx4-Vm07tTvKs-JAAAADcCAABV-@74a4acc6fd>
 <3918A57FF6F7314DB5D704FF1317CC73710A240D@MAIL.DOMAIN.COM>
 <A7a4Rx4-YCR4HQdzo-JAAAADkCAABV-@64d2e82d00>
 <3918A57FF6F7314DB5D704FF1317CC73710A248B@MAIL.DOMAIN.COM>
 <A7a4Rx4-4fZmMdbh6-JAAAADsCAABV-@c3cb23790c>
 <3918A57FF6F7314DB5D704FF1317CC73710A24E0@MAIL.DOMAIN.COM>
 <A7a4Rx4-CB_wyMdBe-KgAAAD4CAABD-@f56da6ea00>
 <61CF77C6E560464D92A9A64E0F42841348899856@MAIL.DOMAIN.COM>
 <A7a4Rx4-Kcw6J=xTm-JAAAAEECAABV-@906e370dbc>
 <3918A57FF6F7314DB5D704FF1317CC73710A2763@MAIL.DOMAIN.COM>
 <A7a4Rx4-1n3m2ZY31-JAAAAE8CAABV-@f1516dc7cf>
 <3918A57FF6F7314DB5D704FF1317CC73710A27E0@MAIL.DOMAIN.COM>
X-Originating-IP: [22.22.22.22]