Change DNS records to point to new service - then wait for DNS caches to expire before taking down old service.

Agreed, especially when you can also force rDNS lookup (even though providers hate it as it's an extra load). Of course as you noted it can be limited when on shared infrastructure. It's really a sham

Custom Reverse DNS for IPs.

Maybe the records were still in the DNS cache?

Don’t have advice regarding the DNS but..

IPv6 I'll gladly add when it matters, won't take but an hour to do the whole fleet and update DNS. There is currently no need as there is no case of ISP users only being able to access IPv6 addresses.

RR DNS + web servers + replicated DB = LowEndHA. 99% of people don't need anything else. 99% of people probably don't even need that.

Domains and DNS: happy with Namesilo and Porkbun, less so with Tucows and Namecheap.

Do yourself a favor. Sign up for ramnode Webhosting shared host. Forward your domains nameservers to them and setup email for your domain through them. Once your comfortable with how the domain dns &a

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@jvnadr hit the nail on the head. Having clean, unbanned IP space with your DNS and all support records setup make the difference between going into the spam folder and possibly making it through to

Consider Mail-in-a-box. The kit handles your DNS perfectly and implement all required verification method which will get you a perfect reputation score on almost every mail-test websites.

When getting a new VPS or dedi just check your IP on https://bgp.he.net/ (RBL tab), ensure you get all green. If some are red, visit their websites and find instructions how to file for removal. Also

* I asked via ticket for Atlanta and reverse DNS - implemented as part of the server delivery.

Manual reverse DNS [PTR] management

Yes, you can set rDNS for the assigned IPs.

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