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My reason was : there's just no way for me to create 2 "low" spec VPS, say for DNS.

Regarding the DNS lookup problem try adding a UFW NAT rule to unblock forwarding of UDP port 53.

Next thing to figure out is how to fix that the client is blocked from DNS lookup through the VPN:

We also eliminated the other problem as some free DNS providers were using spamhaus to check for spammers, we now have our own free dns system and for people wanting more and having premium services,

Seems to be working now. I removed the domain from cloudflare and updated dns with domain provider so must be an issue with cloudflare

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Still not working, I'm using cloudflare for my DNS maybe that's causing the issue

I also disabled cloudflare so it runs as a DNS only. In this scenario, it works fine. I'm working with uptimerobot's support staff to see what's going on.

FYI an update on this issue... it's still ongoing and never really stopped. There are still DNS timeouts and connectivity problems at all hours of the day. The issue is less severe than when I first p

I used to use freedns.afraid.org for dns, they would not even let you add records to zones if the ip was blacklisted.

* Free reverse DNS management

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I am un-sure of what to put for solusVM's reverse DNS section.. I have read the guide but I'm still questioning the right thing to do, specifically the Zone name.

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Not yet required for Gmail, hotmail or Yahoo. Spf and reverse DNs are enough. However, never bad to turn on.

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That is quite simple. Make sure reverse dns matches, both ipv4 and v6, set up spf and don't send spam. Thats the basis, will keep you out of spamboxes.

I wouldnt mind using something like postfix and doing it myself. My concern is how to setup my email/dns enough that I dont look like a spammer. I know with like mailgun/gmail/outlook you sendup you