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They (digitalocean) block the smtp ports on new accounts and you need to contact them to get it unblocked. Other posts suggest it’s just a case of contacting them to get it unblocked. But when I reached out to them they refused to unblock the ports. They said I should ask them again when my account is over 60 days old. That kind of sucks cos I have a contact form on my website that now doesn’t work.
I’m not sure why they haven’t got back to you. I know there was recently an issue with emails not being delivered if you reply from your inbox. Have you tried responding to the ticket through the dashboard?
DigitalOcean are blocking IPv6 SMTP access because they say IPv6 whitelists and blacklists that prevent spam aren’t working properly (see article 'Does DigitalOCean block SMTP access?"). Instead use IPv4 and you’re fine.