A suggestion for kmail

I have several email addresses, and which I use for subscription to mailing
lists varies according to the subject matter.

When I get the first mail from the mailing list, I set up a filter to put the 
mail into its own folder.  Then I use the Mailing List Manager to recognise
which list it is, and to set up the relevant mail address.

The one thing that this function does not do, which would be really useful,
if to notice which of my email addresses the mail was sent to (and if you 
have the "normal" Fancy Headers displayed you can not see it), and set
the appropriate entry in the folder properties as the default ID from which
to send mail.  It strikes me that this would not be difficult to detect and
it would be really useful and stop me sending mail to lists from the wrong
id.

Regards

David