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You can’t. When my ISP switched me to CGNAT, I spent days upgrading everything to IPv6, only to discover that gmail didn’t even support it! (Mail Server to mail server, not the web app) I gave up, asked my ISP IPv4 back and, fortunately, got back a new IPv4. But I fear the day that option will disappear…

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What year was this? While I can't find a source I believe Gmail has supported IPv6 for sending and receiving since the World IPv6 day back in 2011. I've certainly been doing it since 2017.

Your issue might be rather that Gmail actually enforces all their guidelines on IPv6 instead of silently degrading your reputation behind the scenes like they do for IPv4. So proper RDNS, SPF and DKIM are tablestakes with DMARC and MTA-STS strongly recommended.

This was maybe three four years ago. That might be it. I lack rDNS but I have everything else. Except for MTA-STS, I’ll check that out

Yeah, rDNS is a hard requirement for IPv6. I believe you should get a hard reject for missing that with a pointer to the documentation.

My mail server has been known to deliver mail to Gmail using IPv6 if I don't tell it not to. Not sure if Gmail will use IPv6 for incoming mail though.

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