When MailEnable receives a message and appends it's Received: header, it fails to write the PTR value.
For example, MailEnable writes the following:
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Received: from NAM03-BY2-obe.outbound.protection.outlook.com ([104.47.42.44]) by cloudsector.net with MailEnable ESMTPS; Mon, 23 Apr 2018 07:23:16 -0400
Code: Select all
Received: from NAM03-BY2-obe.outbound.protection.outlook.com (mail-by2nam03on0044.outbound.protection.outlook.com [104.47.42.44]) by cloudsector.net with MailEnable ESMTPS; Mon, 23 Apr 2018 07:23:16 -0400