[Mailman-Developers] Question about specific place of source code

Hi all,

i am using mailman 2.1.9. I am making some customizations, and i have a questions about MIME Content-Type.

(I have crawled through the archives...)

If I add a message header (msg_header and msg_footer) mailman sets the

Content-Type: text/plain; charset="us-ascii"

My Question is, if anyone can please point me to the line of code, where this is added to a message. I already looked in Decorate.py but my alterations (e.g. comment out the header addition) did not make any difference. So the place where i looked might not be correct.

I want to see how these are constructed and maybe alter to fit my customization.

Any urgent help would be greatly appreciated.

Thanks so far, L.R.