I think people will conflate doing so at ISP-scale and doing so at residential hobbiyst scale (and everything in between). One would expect differences in outcomes of attempting PTR records in DIA vs. broadband.
"How does Google handle mail from an IPv6 server?"
A few people have posted that it works for them, but unless it has changed recently, per conversations on the mailop mailing list, Google does not treat IPv6 and IPv4 mail the same and that causes non-null issues.
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Mike Hammett
Intelligent Computing Solutions
http://www.ics-il.com
Midwest-IX
http://www.midwest-ix.com
From: "Stephen Satchell" <list@satchell.net>
To: nanog@nanog.org
Sent: Wednesday, February 14, 2024 8:25:03 PM
Subject: Re: The Reg does 240/4
On 2/14/24 4:23 PM, Tom Samplonius wrote:
> The best option is what is happening right now: you can’t get new IPv4
> addresses, so you have to either buy them, or use IPv6. The free market
> is solving the problem right now. Another solution isn’t needed.
Really? How many mail servers are up on IPv6? How many legacy mail
clients can handle IPv6? How many MTA software packages can handle IPv6
today "right out of the box" without specific configuration?
Does any IPv6 enabled ISP provide PTR records for mail servers?
How does Google handle mail from an IPv6 server?
The Internet is not just the Web.