Some email clients do not properly handle content types for attachments with certain file formats. As a result, documents with these file formats are sent as the message text instead of as attachments, and the actual message text is sent as the attachment. If users receive emails where the message and the attachment are reversed, you may need to configure the Distribution Service to override the content type for those attachments' file formats.
Note:
E-Forms are one example of documents with a file format that may be handled incorrectly. By default, the Distribution Service's configuration file is configured to override the content type on E-Forms, allowing them to be sent correctly as attachments.