"Reply" button functionality in KMail (especially with mailing lists)

Hi

I'd like to share some thoughts on how KMail should behave when replying to 
messages.  This was discussed before (ages ago) so I apologise for bringing 
it up again, but I don't think the current behaviour is optimal.

At the moment there's the "Folder -> Mailing list management -> Folder holds a 
mailing list" setting (on or off), and also four Reply buttons:
- Reply;
- Reply to all;
- Reply to list;
- Reply to author.

Currently, if the folder-holds-mailing-list setting is off and the user 
presses "Reply" to a message from a mailing list, then the reply goes to the 
whole list (by extracting the List-Post message header).  This seems 
dangerous to me -- I expect the "Reply" button to go to the author of the 
message in most cases.

I think this behaviour would be better:
  
"Reply" button
  If "Folder holds a mailing list" is ticked for this folder
    - the same as "Reply to List" button
  Otherwise
    - the same as "Reply to Author" button
  
"Reply to List" button
  Try
    - add addresses in "Mail-Followup-To" header to "To"
  Otherwise
    - add address set in "Mailing list management" to "To"
  Otherwise
    - add address in "List-Post" header to "To"
  Otherwise
    - leave "To" empty

"Reply to Author" button
  - Add "Mail-Reply-To" or "Reply-To" or "From" to "To"

"Reply to All" button
  - Do "Reply to List"

  If "To" is empty (so it wasn't a mailing list)
    - Add "Mail-Reply-To" or "Reply-To" or "From" to "To"
  Otherwise (we have a mailing list address in "To")
    - Add "Mail-Reply-To" or "Reply-To" or "From" to "CC"

  - Add "To" and "CC" addresses to "CC"

(In all cases, avoid duplicate addresses etc)

I'm influenced by this: <http://cr.yp.to/proto/replyto.html> but I'm not sure 
what's best for "Reply to All" since KMail also has the "Reply to List" 
function.

Does this seem better?  Logical?  I started editing kmmessage.cpp but I 
decided it was worth checking what everyone thought.

-- 
Matt Blissett

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