The default spamhandler does nothing else than copying the mails in the spam folder to the confirmed ham folder and possibly moving the mail to the inbox (depending on your configuration). So it has no relation to any spamassassin related stuff.
Originally Posted by philippe_veys
The spamassassin spamhandler on the other side, does spamhandler specific stuff, so in the default configuration
the spamhandler only removes the spamassassin wrapping around a mail if you select a message in the spam folder as ham. So it will not iteract with spamassassin itself.
If you set
For this one, how does it interact with spamassassin.
then the bundle will also connect to a running spamd on the hostname and port given in the config file to learn and unlearn spam messages. So if you e.g. click on a mail in the inbox and mark it as spam the mail will be moved to the spam folder and send to spamd for learning as spam. Same applies for ham messages in the spam folder, if you click on them they will be copied to confirmedham and send to spamd for learning as ham.