"Externals email(Yahoo mail) are not going from my company email( Exchange Server 2016) but email is going to gmail and outlook live" please advice me.
Below the Error Message
Generating server: mail.etc.comTotal retry attempts: 17
mira_sf09@yahoo.com
Server returned '400 4.4.7 Message delayed'
Original message headers:
Received: from mail.etc.com (192.168.0.110) by mail.etc.com
(192.168.0.110) with Microsoft SMTP Server (version=TLS1_2,
cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.845.34; Fri, 5 Oct 2018
23:28:33 +0600
Received: from mail.etc.com ([::1]) by mail.etc.com ([::1]) with mapi
id 15.01.0845.034; Fri, 5 Oct 2018 23:28:33 +0600
From: <mira_hossain@etc.com>
To: <mira_sf09@yahoo.com>
Subject: test mail
Thread-Topic: test mail
Thread-Index: AdRc0M11h1pVjLiARpeI9EHpN0CsCA==
Date: Fri, 5 Oct 2018 17:28:33 +0000
Message-ID: <a59555ab7c2b4199bc80982349a03beb@etc.com>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
x-originating-ip: [103.55.200.80]
Content-Type: multipart/alternative;
boundary="_000_a59555ab7c2b4199bc80982349a03bebenafoodcom_"
MIME-Version: 1.0