Step 1: Create e-mail account with mailbox.It means that account can get e-mail :)
Step 2: Update user messaging driver
Step 3: Update Workflow properties
Step 4: Check driver config file (driverconfig.xml) from server. Config file path is "/data/oracle/domains/SOABPM-TEST-DMN/config/fmwconfig/servers/SAOBPM/applications/usermessagingdriver-email/configuration/".
Step 5: Restart SOA servers
Step 6: Create Test Composite
Step 7: Make humantask notification actionable
Step 8: Deploy & Test it.
You can download test application Click!