Drats ... didn't actually go via IPv6 ... will test more later.
From: "Michael Paoli" Michael.Paoli@cal.berkeley.edu Subject: Re: [BALUG-Test] And now IPv4 email/SMTP/lists should be originating from the new IPv4 IP Date: Sun, 15 Dec 2019 07:37:05 -0800
And one more test, with IPv6 temporarily disabled, to force IPv4 ...
From: "Michael Paoli" Michael.Paoli@cal.berkeley.edu Subject: [BALUG-Test] And now IPv4 email/SMTP/lists should be originating from the new IPv4 IP Date: Sun, 15 Dec 2019 07:11:33 -0800
And now IPv4 email/SMTP/lists should be originating from the new IPv4 IP, traffic may be via IPv4 or IPv6 (no change on the IPv6), but at least for that traffic going over IPv4 ...