Is there a list that shows the correct content-types to use for all the supported MMS attachment file types? It can be a bit confusing to try to figure out.
For example, both .jpg and .jpeg have to use 'image/jpeg' ('image/jpg' won't work). To send a .vcf file you have to use 'text/vcard', etc.
I still haven't figured out how to send .html files. I've tried 'text/html', 'text/plain', and 'text/x-html'. It would be a lot easier if these were all just listed out somewhere.