74.48.84.247 ,but I don't buy any dns record for my ip to use.

Just set your DNS records correctly, even the DNSSEC one.

The error message from the first post "Domain Lookup Failed" the error is more likely a DNS issue, do you use dnssec on the domain and if so is it setup correctly.

You could test trial 14 days google workspace and set MX DNS on subdomain and see mail was sended on inbox or not.

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582.50 Mbit/s 84.146 ms Germany, Berlin (DNS:NET) 158.17 Mbit/s 439.64 Mbit/s 109.053 ms Spain, Madrid (MasMovil) 183.69 Mbit/s 489.43 Mbit/s 98.132 ms Italy, Rome (Unidata)

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Does Bunny support IPv6 for DNS yet? They didn't when I last checked.

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You should check Bunny for CDN and DNS.

in your DNS settings you can choose to either proxy a address or not, i always have better latency when proxying the address but your results will vary

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Can't say for sure, just that the error returned from their server stated an unspecified DNS lookup failure. Could be at any number of points.

If this DNS lookup failure is related to the domain, then wouldn't it be the same case with any other provider? or do you mean to the MX server itself?

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I highly recommend sticking with Gmail or Outlook though for working with them, because a DNS lookup failure on their server that they won't call their problem, when your domain is fine, means they're

No, Authoritative. You can run your own dns server with your own zones.

You mean recursive DNS? How do I use it on my clients? is it DoH?

You can put your own DNS server behind NAT, can be useful with geoDNS and/or geocast.