[Users] Assign out-of-thread mail to a thread

[Patrick Boettcher]

Hi,

Some people's mailers seem to break thread-replies. It
happens all the time that replies are not assigned to their
thread-hierarchy. 

Would it be possible to add an option or functionality to manually
re-assign them to their thread - ideally by drag and drop? 

It would be really useful for, e.g, archiving reasons.

Or is there something which already exists?

regards,

--
Patrick.