Allow custom media subtypes

[amikholap]

Hi.

I've added Message constructor argument to override default MIME subtype name (mixed for multipart, plain for text).

multipart/mixed subtype caused problems in some email clients when I tried to inline images using CIDs. As this RFC states CIDs are supposed to work if message content type is multipart/related which tells the client to assume that some parts are related to others. Otherwise all parts are assumed to be self contained and CID link may not work.

Thanks!

[omardlhz]

Is it possible to do this without modifying the current version?

[eLvErDe]

Fixed my issue of hmtl+text emails with embedded images using CID.

Thanks a lot !