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<h2 class="wp-block-heading">550 relay not permitted distribution group contact</h2>



<h2 class="wp-block-heading">Symptoms</h2>



<p>When trying to add an external contact inside a Distribution group. A failure delivery mail with the following NDR is returned.</p>
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<p>Delivery has failed to these recipients or groups:</p>



<p>Externalcontact@domain.com</p>



<p>Your message couldn&#8217;t be delivered and there was no valid enhanced status code being issued by the remote mail system to determine the exact cause, status: &#8216;550 relay not permitted&#8217;.</p>



<p>The following organization rejected your message: mxserver</p>



<p></p>



<h2 class="wp-block-heading">Header </h2>



<pre class="EnlighterJSRAW" data-enlighter-language="generic" data-enlighter-theme="" data-enlighter-highlight="" data-enlighter-linenumbers="" data-enlighter-lineoffset="" data-enlighter-title="" data-enlighter-group="">Diagnostic information for administrators:

Generating server: server
Externalcontact@domain.com

Remote Server returned '550 relay not permitted'

Original message headers:

Resent-From: <;inboundemail@Exchangedomain.com>
Received: from 
with Microsoft SMTP Server (version=TLS1_2,
 cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P521) id 15.1.2375.17; Wed, 15
 Dec 2021 11:53:30 -0500
Received: from mail-ot1-f41.google.com (209.85.210.41) by
 with Microsoft SMTP Server (version=TLS1_2,
 cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA_P384) id 15.1.2375.17 via Frontend
 Transport; Wed, 15 Dec 2021 11:53:30 -0500
Received: by mail-ot1-f41.google.com with SMTP id a23-20020a9d4717000000b0056c15d6d0caso25610296otf.12
 for <;inboundemail@Exchangedomain.com>; Wed, 15 Dec 2021 08:53:01 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
 d=gmail.com; s=20210112;
 h=mime-version:references:in-reply-to:from:date:message-id:subject:to;
 bh=rR2IMeF7H4JDA9rxaP9qe9SS4+k1fEFk6/Y7HUCR5us=;
 b=NV4VaI1l4JibchEYURu8Z0pAkxU2Km1s5xNxC3pE+vHL/7vd77ut2ri0zUvBqMRcLr
 kOSnRYnDeMnc7EAbsOJRP2oSx6afnHB1yN8WjMijDE/Va/0jOp7Ni4K0PTXIyz2X0W5i
 VPQuoTgOsyKkjN+HZqVpXgxHy8RyRNkiTnUsutwRIZZWevIoHC/p0cwad8yN6tIdCVif
 IMkACRMkA0HeAzBR/v0ctAChdUpkbcBXA+85hbuO2O8CQdXBCBCf4EzpjqiI97QK24yf
 oedS61hmS2qb2zFQ6f8qxmYBgxdK4lQWdI9TdurXmpnQHBKZFIqW56US0cMQ3jCpSF9q
 Se2A==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
 d=1e100.net; s=20210112;
 h=x-gm-message-state:mime-version:references:in-reply-to:from:date
 :message-id:subject:to;
 bh=rR2IMeF7H4JDA9rxaP9qe9SS4+k1fEFk6/Y7HUCR5us=;
 b=qVj/PXzNyVqwff+McPc2WmcrhKnU1KzHFugZOqxTRB+v+IKASjxOXzq4oernUflv1P
 ApDShejS2jAO6czxgamOrV4i4E7MUlqM1ZOAORM1+ZZiicTPhLk4ybx88t6Ex6xWG8x1
 CayHD9LjorI/UGhs60fFXpfxREnRvz1mMXk4RQlUVGn7oQvlJZaApknskvs/KDaxB3K4
 l1HvunANu25x9/zmf6OuJEkNuhUQWPnh5TESf52pLknaUmeHBA9Ff4LhEFLoyuj2KwxX
 jDfyvQ3RRs8kN3S+IQntHrukyU6cIy4xskUiSzOUa4wb/b6SfSu7sVb5wy/3MzUcPfwQ
 NJuA==
X-Gm-Message-State: AOAM532yV7/oLUbulh/fnSKX/dvcwEJRrBUakKGRB2AAjJBFmHgQ1juk
	htSdNKTpkhrpu4K0SDKv8LbcseSolYSLvjbVKAFNgKmI1m/3Fg==
X-Google-Smtp-Source: ABdhPJyCyLPmOHEOsFfrUD36h6e5hI9mquwq0Sr3Q+d/MecZbT33ghjh5xXztarpHRBZm944nU8Zrrg/gk50FxN5cxk=
X-Received: by 2002:a9d:7b51:: with SMTP id f17mr9431931oto.88.1639587180247;
 Wed, 15 Dec 2021 08:53:00 -0800 (PST)
MIME-Version: 1.0
References: <;cad49hozzrxa94krz4t+3pdqre=npiq+vv8svw3hbcnyzbca_dg@mail.gmail.com>
In-Reply-To: <;cad49hozzrxa94krz4t+3pdqre=npiq+vv8svw3hbcnyzbca_dg@mail.gmail.com>
From: External Sender <;Sender@gmail.com>
Date: Wed, 15 Dec 2021 22:22:47 +0530
Message-ID: <;cad49hoym7ryqqfrzm++=xse4yh-g6pzy10xfo_bqnpyffhc=9g@mail.gmail.com>
Subject: Fwd: test email to Exchange DG
To: <;inboundemail@Exchangedomain.com>
Content-Type: multipart/alternative; boundary="00000000000074fd9b05d33223fa"
Return-Path: Sender@gmail.com
X-Auto-Response-Suppress: DR, OOF, AutoReply
</pre>



<h2 class="wp-block-heading">Cause:</h2>



<p>By default, the ReportToManagerEnabled parameter is set to False and the ReportToOriginatorEnabled parameter is set to True when a distribution group is created in Exchange Online. When the parameters are both set to False, the Return-Path field in the header of the message is <;>; (blank). This means that the remote messaging system will not send delivery reports to the user who sent the message to the distribution group.</p>
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<p>Additionally, if spam filtering is enabled on the remote messaging system, the message is dropped, and delivery reports are suppressed. This occurs because some anti-spam devices might flag messages whose Return-Path field is blank and not let the messages be delivered.</p>



<h2 class="wp-block-heading">Resolution:</h2>



<p>Set-DistributionGroup -ReportToManagerEnabled $true -ReportToOriginatorEnabled $false -Identity distributiongroup@domain.com</p>



<p></p>



<figure class="wp-block-image size-full"><img src="https://www.moh10ly.com/wp-content/uploads/2021/12/image-1.png" alt="" class="wp-image-9239"/> 

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</figure>



<p>REF:</p>
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<p><a href="https://docs.microsoft.com/en-US/exchange/troubleshoot/email-delivery/external-recipients-not-receiving-distribution-group-emails">https://docs.microsoft.com/en-US/exchange/troubleshoot/email-delivery/external-recipients-not-receiving-distribution-group-emails</a></p>



<p></p>
</p>
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