We would suggest you check the following things:
1) Newsletters must be uniquely named. If you send one that is not uniquely named, it will not send.
2) Perhaps it's in queue - we can't make guarantees as to when the email is sent as it is sent out gradually during the day. If you don't see at least one email sent within 4 hours of sending, please contact us at support to place a request to check it with our engineers.
3) Do you have enough email credits?
4) Have you sent it now or scheduled to send for another date?
Please contact us on live chat if you have any further queries on it.
