Mutt
This nice fix was found here
Simple steps:
add following lines in your ~/.muttrc
set sort=threads
#set sort=reverse-date
set auto_tag=yes
set duplicate_threads = yesset move = yes
macro index M “T.*\n;WN” “Mark all messages as read”
start mutt, all duplicate messages will be marked as ~=
type T to tag message match ~=, then type d to delete. that’s simple nice way!!
Evolutiom
highlight emails, right click the mouse,select Remove duplicate messages.
it’s amazing and simple.
家园 
Hi, there is no such option in Evolution…
I have version 2.28.3 and there is not such option.
Is there an add-on to provide this option?
my evolution is 3.2.3. I can’t remember how it was in older version. sorry