I know this thread is quite old but the google sent me here.
One of our Digital Ocean droplet is blocked. We can't send email to our customers who have Verizon email address.
The white listing request was filled and came back the generic
Your IP has been blocked because of spam issues or because your ISP indicates that it is dynamically assigned
No Reverse Hostname associated with your IP address.
Sooo please help!!!
Your issue has been escalated to a Verizon agent. Before the agent can begin assisting you, they will need to collect further information from you. Please go to your profile page for the forum and scroll down the page to an area titled "My Support Cases". You can reach your profile page by clicking on your name located above your post, or at the top right of this page.
Under "My Support Cases" you will find a link to the private board where you and the agent may exchange information. The title of your post is the link. This should be checked on a frequent basis, as the agent may be waiting for information from you before they can proceed with any actions. To ensure you know when they have responded to you, you may subscribe to the case. At the top right of your support case there is a gear icon which provides a drop down menu with support case options. Click that and choose "subscribe". Please keep all correspondence regarding your issue in the private support portal.