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: 1.0
X-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-printable

Text first

--_005_D8FB5BDDF996406AB2DC5D568B915E90contosocom_
Content-Type: image/png; name="image1.PNG"
Content-Description: image1.PNG
Content-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/4QCKRXhpZgAATU0AKgAAAAgAAYdpAAQAAAABAAAAGgAAAAAA
BZADAAIAAAAUAAAAXJKGAAcAAAASAAAAcKABAAMAAAABAAEAAKACAAQAAAABAAAEAKADAAQAAAAB

Properties

Article ID: 3108205 - Last Review: Oct 25, 2016 - Revision: 1

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

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