rabbit queue not delivering msg after queuing

I am using the rabbitmq.js plugin for queuing the emails to rabbit.
In the beginning, it was not getting triggered, so I had to update the hook from "queue" to "queue_outbound"
Then the mails were getting queued to the rabbit but were not getting delivered, so I invoked the send_email functionality manually by calling the "outbound.send_email" function after queuing the msg to rabbit.
Now, mails are getting delivered, however they are not getting deleted from the queue.

Update - While debugging I realized that mails are getting delivered via default disk queue.
So, the current issue is rabbit queue is only queuing the mails and not delivering them.

Thanks in advance!