After more testing, this seems to be a resolver issue in sendmail, since
I can specify an IPv6 address directly as a smart host and it works. If
it's a config problem, I don't know what that might be, and it doesn't
explain the existing install no longer trying to use IPv6 after
upgrading to
** Tags added: rls-ff-incoming
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https://bugs.launchpad.net/bugs/1894379
Title:
No IPv6 outbound from Sendmail starting with 20.04
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** Package changed: ubuntu => sendmail (Ubuntu)
** Tags added: focal
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https://bugs.launchpad.net/bugs/1894379
Title:
No IPv6 outbound from Sendmail starting with 20.04
To manage
Thank you for taking the time to report this bug and helping to make
Ubuntu better. It seems that your bug report is not filed about a
specific source package though, rather it is just filed against Ubuntu
in general. It is important that bug reports be filed about source
packages so that people
