# ubuntu 20.04echo 'export PATH=/usr/sbin/:$PATH' >> /etc/profilesystemctl rebootcustom_dns4='1.1.1.1 8.8.8.8'sed -i "/\[Resolve\]/a DNS=$custom_dns4" /etc/systemd/reso

It seems the VPS has DNS issues, outdated repositories, missing commands and etc. I had to manually solve it myself by doing

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Use case? For DNS & IP Tools? Ping?

https://mxroutedocs.com/dns/dnsoverview/

to temporarily block UDP (except whitelisted DNS/NTP subnets). In the meantime we’ve installed additional capacity on the filtering cluster to be able to actively filter the attacks instead dropping

Don't go with Porkbun, if you want Support that actually knows what DNS is, how it works, especially glue records.

* 2 Dedicated IPv4 Addresses (Reverse DNS / PTR Available)

Maybe they cache DNS locally, so there is a big lag between propagation and the records they use when analyzing email.

Well, one thing you can be sure of is that it's almost certainly entirely internal. Your DNS or Google's content filters. Google avoids using third party blacklists in almost all cases, and the except

Custom rDNS

If the DNS parameters are correct, it is possible that the domain has a blacklist or low reputation. are the emails going out without links? If there is a signature or link pointing to a listed domain

Mbit/s 182.03 Mbit/s 78.816 msGermany, Berlin (DNS:NET) 172.30 Mbit/s 274.05 Mbit/s 104.280 msSpain, Madrid (MasMovil) 113.63 Mbit/s 101.77 Mbit/s 89.797 msItaly, Rome (Unidata) 141.09 Mbit/s 75.75 M

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A while ago it used to be the case that adding a DNS record for an IP would also add that same IP as an IP Access Rule under Allow. Unsure why, but that's what it was.

Or get some public NAT DNS as outbound nodes..

Regarding freedns.afraid.org, DNS wasn't down, just their frontpage.

Based on a series of VPSs, specifically for running mail and dns, so far with 8 separate providers to date over 17 years.

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