For PDF attachment it should be 'Content-Type: application/pdf'

>This is what appears in the message header
>
>MIME-Version: 1.0
>Content Type: multipart/mixed;
> boundary=".."
>X-Mailer: Microsoft Office Outlook 12.0
>...
>...
>
>This is a multi-part message in MIME format.
>
>-----=NextPart_00_0001_01CB.........
>Content-Type: text/plain;
>charset="iso-8859-1"
>Content-Transfer-Encoding: 7bit
>
>>Did you check the source of the message to see what MIME type is?
>>Did you try other mail clients?
>>
>>>Yes it does. Any typed text first, then the funny gibberish looking text.
>>>
>>>>Does message have body?
>>>>
>>>>>Hi Sergey, it is Outlook 2007 as well.
>>>>>
>>>>>>What's recipient's mail client?