> How can I unstupid sendmail here?
I don't think sendmail is being stupid here as it is doing what it has been
doing under 8.x and 9.1 (the code is the same). I think something changed with
the upgrade to 9.1. As far as tracking it down, the sendmail code does:
getipnodebyname("acme.spoerlein.net", AF_INET6, AI_DEFAULT|AI_ALL, &err);
This will only return an IPv4 mapped address if:
1. There are no IPv6 addresses configured on the interfaces. How are your IPv6
addresses assigned? If auto-configured (DHCPv6, RTADV), is it possible
sendmail is being started before autoconfiguration has completed? Restarting
the MTA after boot and seeing if it still gets the mapped address will say
whether or not this is the cause.
2. The query for an AAAA record for acme.spoerlein.net failed. This doesn't
appear to be the case for dns based on your dig output (assuming you ran that
dig command on the same machine that is exhibiting the problem). However, your
nsswitch.conf lists hosts before dns and there have been broken name resolution
implementations that, with 'hosts' listed first in nsswitch.conf have given
back bad info if the first hostname match didn't have the IPv6 address. You
could try switching the order in /etc/hosts to see if this helps. (Note, the
broken implementation was not FreeBSD.)
You can also test theory #2 by writing a small C program to do the
getipnodebyname() call shown above and see what you get. If it gives the same
bad address, then you need to look outside of sendmail. In the mean time,
although not optimal, you can work around the issue by using the IPv6 address
instead of the hostname in the Addr= equate.
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