You are using static notifications so you set the property 'notification.newtasks' or 'notification.assigned' to 'true' but users with a valid email address defined in their profile do not receive notifications for the task they are assigned to or for which they are defined as potential owner.
You want to get more info about the issue from the traces.
As from 71X
JAVA mail service, javamail, notification, BPEM, BPM, tc~bpem~base~ear, email, Configuring Mail , KBA , BC-BMT-BPM , Business Process Management (BPM) , BC-JAS-ADM-ADM , Administration , BC-JAS-ADM , Local Admin Tools , How To
About this pageThis is a preview of a SAP Knowledge Base Article. Click more to access the full version on SAP ONE Support launchpad (Login required).
Search for additional results
Visit SAP Support Portal's SAP Notes and KBA Search.