First, to clarify, e-mail is not a file format, it's a method of sending text and files and other objects. (Certain email clients [software] have both generic and proprietary formats that they use when storing emails individually as files, but that's not relevant)
Your best way to send it is as an attachment. If the recipient has AS9 you can just send the .skf file. Otherwise, for general use (i.e. something that practically everybody can open) converting it to a pdf and sending the pdf as an attachment is a nice way.