Erpnext: email sent but not receive in email queue

Workflow already checked email sent.
I am trying to send out an email for approval when submitting a certain doctype: SOP eg

Appreciate if anyone can take a guess at it.

Whenever a workflow action is updated, an RQ job is created for it. You can check the RQ job status; if the RQ job fails for any reason, the email will not appear in the email queue.

What is RQ and how can I find it? :slight_smile:

Jeel, I managed to create a workflow and notification with my doctype upon submit the emaill will be triggered as supposedly but in this case it does not appear in the email queue list or error log. How can I check this RQ job?