Instead of reading from the table directly you can fetch the details from start process request or Infatask variables in the outofbox workflows.
For email you will need to enable the email service in ActiveVOS console.
Also make sure in MDM hub console you've email ids configured for all the users, which you can use in your avos workflows Email task
As mentioned by Kunal, you can get the details from Infatask/ProcessTaskResponse as well and send an email.
One thing to take into consideration is, you might have to fork the human task creation and along with triggering the email with a timer (delay of 2 secs) to ensure the human task is created successfully and then an email is sent to the DL/users.
If you want to get further details from the base objects, you can use the data access request/Business entity Services to be sent in the email .For example Party Name and Address.