On Fri, 18 Aug 2017 02:38:19 -0400 Rupert Gallagher wrote: > What is the problem that you wish to solve? > > The purpose of SA is to flag SPAM. In this case, you already have all > the information you need, because subtype specification is MANDATORY. > There are no default subtypes. SA must flag the email, because it is > not compliant
A mime section without a Content-Type header is assumed to be "text/plain; charset=us-ascii", so it has a subtype of "plain". > to RFC 822. RFC 822 doesn't say anything about MIME.