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With Bionic, Sendmail would send email over IPv4 and IPv6, which I could see in logs and DMARC aggregate reports. Since upgrading to Focal, it's only attempting to send over IPv4, but I can receive email just fine over IPv4 or IPv6. I'm seeing that both with an upgrade and a fresh install.

What changed, then? Not my configuration (in the case of the upgrade, anyway), and I don't see anything relevant in the package changelogs between the 2 versions.

EDIT: On further testing, it looks like Sendmail in 20.04 isn't even trying to get IPv6 addresses for servers. If only an IPv6 address is available, I get a "host unknown" bounce.

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