I have a list that allows multi-parts(styled/attachment), and I have a recipe to insert a body header:

:0 fhw | cat - header.txt

It works fine for all plain text mails. However for mails with multi-parts the "inserted" header does not show in distributed mails. I understand it must be that the header was inserted in the "begining of body" but outside of "multipart" boundary marks thus gets dropped in subsequent processes (by MTA or email clients).

Any possible work around?

Zhiliang