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The script only seems to check that it can connect to the SMTP port - that tells you next to nothing. Most mail servers will only tell you that you are blocked after a "RCPT TO" or e

Are you sure you dont have any IPv6? You can check the DNS management for your IPv6 adress.

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You can find Discord's server locations by hostname using SecurityTrails' DNS subdomain search for 'discord.gg'. For example, like this.

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Everything else points to there being no relationship between them - different domain registrar, different DNS providers, without s uses google for mail and has SPF, with s has different google mail s

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Guess they're a fine seedbox. They small ones I mostly use for cdn/DNS/vpn.

Custom Reverse DNS

For DNS I currently have a MariaDB primary with several replicas, and scripts to quickly promote a replica to primary; API and web traffic can switch to the new primary with a DNS change.

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* Reverse DNS - Coming soon

* multi-provider/region dns that does loadbalancing queries (e.g. latency, geoproximity, endpoint health based, e.g., from cloudflare loadbalancer, aws route 53 etc.)