Singapore IP Blacklisted with Outlook, Mail-Abuse, Symantec and more...


We recently setup a droplet with DigitalOcean and installed cPanel, LiteSpeed, Redis and a bunch of other softwares.

We did all of the following:

  • Setup appropriate DMARC records
  • Setup appropriate DNSSEC records
  • Setup appropriate SPF records
  • Setup appropriate DKIM records
  • Ensured PTR was setup.
  • Disabled the ability to create/use email accounts on the server itself. Emails are managed by Office365 or GSuite
  • Enabled cPanels “SMTP Restrictions”
  • Enabled a limit of 150 emails per domain per hour
  • Setup the default/catch-all forwarder to “fail”.
  • Setup the server to hold outgoing mail that is “potentially spam”
  • Setup the server so if a domain sends 200+ unique emails out per hour it gets flagged as a potential spammer.
  • Restricted outgoing SMTP mail to root, exim and mailman only.

The only emails our droplet sends are:

  • cPanel usage/security emails
  • Imunify360 emails
  • Wordfence security emails
  • WordPress password reset emails
  • WordPress contact form emails (Of which is protected with Google’s reCAPTCHA)

I’ve check the emails from the websites with and they score a perfect 10/10 with the only improvement possible being “Add a List-Unsubscribe header” of which is to be expected because it was a single email that wasn’t part of a subscription.

I’ve checked the server IP against various blacklists and the IP is listed on a few because DO has had a lot of abuse on its network so the entire AS is “limited”

However when I check IP’s around my IP on the likes of especially:

What am I supposed to do here to allow cPanel/Websites to send a few basic emails without them being blocked. I can’t use a Floating IP because you can’t setup a PTR for them…

I don’t want to have to try and move the droplet to another country especially when DigitalOcean doesn’t have a “Migrate droplet to different zone” feature.

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I’ve not received anything back from DigitalOcean or any of the lists that have the IP blocked so as a quick fix I am wanting to fix it by using an external mailer.

For one of our other services we use Mailgun with a dedicated IP however my attempt to setup Mailgun for cPanel/WHM didn’t work.

The trace report showed:

ECDHE-RSA-AES128-GCM-SHA256:128 CV=yes: SMTP error from remote mail server after pipelined MAIL SIZE=3316: 550 5.7.1 Relaying denied

I assume this is because isn’t the same as the cPanel/WHM?

How do I setup relaying with Mailgun? If not possible, what other providers can I use that I don’t have to authenticate every single domain with them?

Would I have to setup a cPanel mail node to achieve this?