Public bug reported:
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.
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.
What changed, then? Not my configuration, in the case of the upgrade,
and I don't see anything relevant in the package changelogs between the
2 versions.
** Affects: ubuntu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1894379
Title:
No IPv6 outbound from Sendmail starting with 20.04
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