Corsaire Security Advisory – By using malformed MIME encapsulation techniques centered on the presence of fields containing an RFC822 comment, embedded file attachment blocking functionality can be evaded.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/34359/c030804-009.txt
Source: https://packetstormsecurity.com/files/34359/Corsaire-Security-Advisory-2003-08-04.9.html