Apple Mail sends attachments as inline are are marked as alternate views

Apple Mail sends attachments as inline are are marked as alternate views and the name of the attachment is lost.

The behavious can be changed http://katiefloyd.me/blog/get-rid-of-inline-attachments-in-apple-mail otherwise an attachment will look like this:

Content-Type: multipart/mixed; boundary=Apple-Mail-2--769176039

--Apple-Mail-2--769176039
Content-Transfer-Encoding: 7bit
Content-Type: text/plain;
 charset=us-ascii

Hello
--Apple-Mail-2--769176039
Content-Disposition: inline;
 filename=" xxx.pdf"
Content-Type: application/pdf;
 name=" xxx.pdf"
Content-Transfer-Encoding: base64