>>>>> Reiner Steib wrote:
>> I didn't try your code yet, but I still think that point should not
>> move when inside the headers.

`C-c C-m m' (mml-insert-multipart) and `C-c C-m p' (mml-insert-part)
insert a MIME tag even in the message header.  Do you have an idea
to fix it?  I vote for stopping it with an error as follows: