Those under compliance supervision:
When your newsletter is "On-Hold" section it indicates that is it requires the attention/approval of your compliance officer and has moved from your workflow into your compliance officers. You will receive an email notification once approved.
If you are not on a compliance workflow:
Although this is a rare occurrence, the send task for the newsletter may have been put in the queue and not been picked up by a worker process yet. We apologize for any inconveniences. Please notify us immediately so we can manually retry and verify it has been sent to you. Contact us at firstname.lastname@example.org