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Dell PowerProtect Cyber Recovery 19.16 Product Guide

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Verifying TLS encryption

Verify that the mail/relay server is encrypted with Transport Layer Security (TLS).

About this task

To verify that delivered email messages have end-to-end encryption, see the email message headers.

NOTE:The following steps are for retrieving the message headers to verify TLS encryption using Outlook. The procedure for other applications differs. See the application documentation for information about how to retrieve message headers.

Steps

  1. From Outlook, double-click an email message.
  2. Click File > Properties.
  3. See the Internet headers box.
    The information includes messages about the servers that delivered the email message. By looking at the Received header, you can see that the servers are enabled to use TLS encryption. The email messages from the sender's email server to the recipient's email server are protected during the transfer.

Message headers

The following examples show message headers that verify that TLS encryption was used: 

 Received: from XXX.XXX.prod.outlook.com(2603:10b6:907::26) by XXX.XXX.prod.outlook.com
(2603:10b6:208:276::21) with Microsoft SMTP Server(version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6977.29; Mon, 13 Nov 2023 18:38:38
+0000
 Received: from XXX.XXX.prod.outlook.com
(2603:10b6:907:0:cafe::73) by XXX.XXX.outlook.office365.com
(2603:10b6:907::26) with Microsoft SMTP Server (version=TLS1_2,cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6977.31 via Frontend Transport; Mon, 13 Nov
2023 18:38:37 +0000
 Received: from XXX.XX.XX.com (XXX.XXX.XX.XX) by XXX.mail.protection.outlook.com (XX.XXX.XXX.XXX) with Microsoft
SMTP Server (version=TLS1_2,cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7025.0 via Frontend Transport; Mon, 13 Nov
2023 18:38:37 +0000

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