Headers are getting merged

[rameshnbn]

When converting eml file to msg, the headers with the same key (Example Received headers) are getting merged into single Received header. When forwarding such msg file, the message is not getting processed the way it should. When we tried to save the eml file as msg file from Outlook, all the headers are being retained as is.

For example, the original headers:

Received: from PAWP176MB0298.EURP176.PROD.OUTLOOK.COM (2603:10a6:102:378::22) by
 AMXP176MB0166.EURP176.PROD.OUTLOOK.COM with HTTPS; Fri, 28 Jun 2024 11:15:24
 +0000
Received: from DUZPR01CA0128.eurprd01.prod.exchangelabs.com (2603:10a6:10:4bc::21) by
 PAWP176MB0298.EURP176.PROD.OUTLOOK.COM (2603:10a6:102:378::22) with
 Microsoft SMTP Server (version=TLS1_2,
 cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7698.36; Fri, 28 Jun
 2024 11:15:22 +0000
Received: from DB1PEPF0003922E.eurprd03.prod.outlook.com (2603:10a6:10:4bc:cafe::68) by
 DUZPR01CA0128.outlook.office365.com (2603:10a6:10:4bc::21) with Microsoft
 SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384)
 id 15.20.7719.25 via Frontend Transport; Fri, 28 Jun 2024 11:15:22 +0000

Are being converted as:

Received: from PAWP176MB0298.EURP176.PROD.OUTLOOK.COM (2603:10a6:102:378::22) by AMXP176MB0166.EURP176.PROD.OUTLOOK.COM with HTTPS; Fri, 28 Jun 2024 11:15:24 +0000
from DUZPR01CA0128.eurprd01.prod.exchangelabs.com (2603:10a6:10:4bc::21) by PAWP176MB0298.EURP176.PROD.OUTLOOK.COM (2603:10a6:102:378::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7698.36; Fri, 28 Jun 2024 11:15:22 +0000
from DB1PEPF0003922E.eurprd03.prod.outlook.com (2603:10a6:10:4bc:cafe::68) by DUZPR01CA0128.outlook.office365.com (2603:10a6:10:4bc::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7719.25 via Frontend Transport; Fri, 28 Jun 2024 11:15:22 +0000