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Why are you sending e-mail from a shared IP space instead of using a service like Sendgrid?
Hello all,
If you’re just attempting to send outgoing mail from the server, I strongly recommend using a service like Sendgrid or Mandrill. They both offer free tiers. If that’s not an option, you can recreate your droplet in order to pick up a new IP address. The system attempts to reserve the IP for you if you create a new droplet with the same name as the old one. So in order to ensure that you receive a new IP, create the new one before destroying the old one.
Regarding the blacklist itself, I could suggest contacting the DigitalOcean support team directly for further assistance.
https://www.digitalocean.com/support/
As a side note, here is an interesting read on why you may not want to run your own mail server but rather use an SMTP provider:
https://www.digitalocean.com/community/tutorials/why-you-may-not-want-to-run-your-own-mail-server
Regards, Alex