Messages that have inline attachments are received as multiple attachments in Exchange Server

Symptoms
In a Microsoft Exchange Server environment, a user sends an email message that has one or more inline attachments. When the recipient receives the message, it has no inline attachments. Instead the message contains one or more attachments. These attachments may include text files that contain text content from the original body of the message.
More information
Exchange uses the multipart/related format for inline attachments and these messages are sent using the multipart/mixed format.

The following is a sample message:

Content-Type: multipart/mixed; boundary="_005_D8FB5BDDF996406AB2DC5D568B915E90contosocom_"MIME-Version: 1.0X-MS-Exchange-Organization-ContentConversionOptions: False;00160000;True;;iso-8859-1--_005_D8FB5BDDF996406AB2DC5D568B915E90contosocom_Content-Type: text/plain; charset="us-ascii"Content-ID: <410CE56D5777AA47AD1FE9D67F555E14@contoso.com>Content-Transfer-Encoding: quoted-printableText first--_005_D8FB5BDDF996406AB2DC5D568B915E90contosocom_Content-Type: image/png; name="image1.PNG"Content-Description: image1.PNGContent-Disposition: attachment; filename="image1.PNG"; size=75040; creation-date="Wed, 30 Dec 2015 14:02:31 GMT"; modification-date="Wed, 30 Dec 2015 14:02:31 GMT"Content-ID: <0BE526FEDDDBFA4696A137EE7FAB0129@contoso.com>Content-Transfer-Encoding: base64/9j/4AAQSkZJRgABAQAASABIAAD/4QCKRXhpZgAATU0AKgAAAAgAAYdpAAQAAAABAAAAGgAAAAAABZADAAIAAAAUAAAAXJKGAAcAAAASAAAAcKABAAMAAAABAAEAAKACAAQAAAABAAAEAKADAAQAAAAB

Properties

Article ID: 3108205 - Last Review: 10/25/2016 20:18:00 - Revision: 7.0

Exchange Server 2016 Enterprise Edition, Exchange Server 2016 Standard Edition, Microsoft Exchange Server 2013 Enterprise, Microsoft Exchange Server 2013 Standard, Microsoft Exchange Server 2010 Standard, Microsoft Exchange Server 2007 Enterprise Edition, Microsoft Exchange Server 2007 Standard Edition, Microsoft Exchange Online

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