The primary cause of this is when sending through an Apple email account such as @me.com or @mac.com. This is due to Apple's strict filtering of file content — the server actual scans through the content of the PDF file — they deem to be sexually explicit or that *could* resemble spam. Apple’s email servers will not let that file attachment through to the recipient.
Those files will need to be sent through a non-Apple email account such as Gmail or Hotmail.
Tag: Movie Magic Screenwriter 6