kmail2 and mutt - which lock list?

[Hans <hans.ullrich@loop.de>]

Hello folks, 

I am using kmail2 and mutt. But I am not sure, which lock method to use.

This is want I want:

1. Mails should be read and filtered by kmail2
2. Mails, I deleted in kmail2 shall also be deleted in mutt.

I saw four different settings:
 - Procmail lockfile
- Muttdot lockfile 
- Muttdot lockfile with accessrights 
- None

(This was translated, as my KDE desktop is German)

It was not not quite clear for me, what these four poits are really doing and 
found no (for me satisfying) explanation.

Hope, someone can make things clearer,

Thanks for any response.

Best

Hans