i created a new entry form for taks folders, based on the original form _taskEntry.
There is a checkbox called:
"Send an E-Mail Notification to Assignees"
which i didn't edit... Anyway this seems not to work with my custom form....
I can create new entries and modify them but the Assignees don't receive mails if I check this box.

I configured the task folder as followed:
* Allowed Views: Tasks
* Default View: Tasks
* Default Entry Types: "my custom entry form"
* Workflow Associations: _task_workflow
* Allowed Workflows: _task_workflow

Any Ideas where to start searching for the reason?

Thanks in advance,