problem with kmail, have to deliver the logs of mail transport.

Hi.
I have currently a problem with authorization with an account at "mailbox.org" 
a German email provider. In order to be able to understand what the issue is, 
why the authorization fails etc, they ask me the logs of the mail program. 
That is of kmail? Or maybe also of postfix (if postfix is in leap the 
responsible program). 
Could somebody please point me to the places where kmail and or any other 
related sub program deposits the logs of failed sending / receiving 
authorizations? 

Thank you. 


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