What are MIME types and which ones do I use?
MIME types are descriptions of the contents of a file. For a .jpg image, the MIME type is “image/jpeg”. With the proper MIME type, the receiver knows how to handle the incoming file. Sprint’s servers are a bit more picky. They require specific MIME types to be sent by a web server in order for a file to make it to your phone. Here is a list of file extensions and their MIME types.
