[ChrisMarshallNY]

Is this from iOS? I just tested from MacOS, and the only IPs were for the transit and auth servers.

I'm not actually doubting it. saagarjha knows his stuff. I just don't see it, so maybe I'm holding it wrong.

[frollogaston]

Same, I remember it being in the headers long ago but don't see it now. macOS Tahoe, Mail.app client, iCloud email sending to itself or to my Gmail, both set up in default ways, IPv6 disabled

[ChrisMarshallNY]

From what I see above, it looks like the trick is to send from Mail.app to an account read by a different app (maybe just Gmail?).

I would need to test with my hosting Webmail client, so maybe tomorrow.

[fckapple]

See my comment here: https://news.ycombinator.com/item?id=48758444.

[ChrisMarshallNY]

I saw that, in my headers, but in my case, it was not an IP in any subnet of mine.

I’ll mess around, today, and see what comes up.