> Hello all and apologies if this is off topic, but not quite sure where > to ask the question.
> In working on my Ruby mail generator / parser > (http://github.com/mikel/mail) I ran into this inside of 2045 part 1: > encoding := "Content-Transfer-Encoding" ":" mechanism > mechanism := "7bit" / "8bit" / "binary" / > "quoted-printable" / "base64" / > ietf-token / x-token > ietf-token := <An extension token defined by a > standards-track RFC and registered > with IANA.> > The only IANA public list I can find is: > http://www.iana.org/assignments/transfer-encodings/ which matches the > list already defined in mechanism. Correct. There have been no additional content transfer encodings standardized since RFC 2045. > Is this the only list of this type? It's the list MIME is talking about. > Or am I missing something? The only thing you're missing is that there are a number of x- token names used for various other CTEs. However, while such things were seen fairly regularly back when MIME was first defined, they have mostly disppeared over time. Ned
