by johirsh » Mon Apr 29, 2013 1:25 pm
not may, will occur with Apple mail... the link you provided says that bad header may cause this
My mail server has indicated that your mail has errror in it
X-Comment: Sending client does not conform to RFC822 minimum requirements
X-Comment: Date has been added by Maillennium.
X-Virus-Raelly-Scanned: amavisd-new at theoceanwindow-bv.com
X-Amavis-Alert: BAD HEADER SECTION, Missing required header field: "Date"
Mime-Version: 1.0
you might want to take a look at that