I personally feel that it has something to do with my MX or DNS records.

- Reverse DNS

As for personal email, again, it's up to you. It's certainly doable, but how much headache is it worth to you when you could pay a few euros to a provider that lets you use your own domain and with th

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Use the .eu domain if using MiaB to handle DNS. Otherwise, either .nl or .eu are good. Avoid .xyz like the plague.

My site is hosted on a Litespeed server so moved away from Cloudflare and using Quic.cloud CDN. However, I use Cloudflare for DNS hosting.

I am thinking for a simple personal mailserver, maybe 512m ram, 1 core cpu, 20g disk are enough? and a good IP reputation as well as reverse DNS is required. how do you think of it?

alt dns server :O

DNS: Google Domains DNS (anycast with Google's network) or DigitalOcean DNS.

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IMO that's a solved problem though. You can use caddy with the dns.cloudflare plugin enabled, and provide your Cloudflare API key to caddy so that it can fetch and renew certs at the right cadence.

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Figuring out your origin isn't that difficult either; if you have a website that sends email over SMTP, the "Received" header may expose your origin IP. Or you could look for the web

Further, these days it's easy to get a certificate of the same domain name behind Cloudflare through the DNS-01 challenge. If you use caddy, it's just two lines of configuration.

Even if it is a NAT VPS, in most cases, running this script and specifying the port number and DNS will complete the Wireguard setup.

* rDNS update

Been messing with some anycast projects with the goal to deploy https://incogdns.com and https://incogcdn.com

just use cloudflare dns, and minimum/low security setting, and disable full page caching and your site will run faster with less bugs as mentioned in OP's linked post.

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