However, grep -R 127.0.0.1 /etc reveals, that sendmail in many places
assumes localhost to be on 127.0.0.1 instead of looking it up in
/etc/hosts or using 127.0.0.0/8 to identify a local connection.

calling 127.0.0.1 from jail always loops back within jail. it's all fine.


I worry that more programmers made those assumptions, possibly breaking
more tools.

My question is: Who's the right guy to beg to fix sendmail or
alternatively would it be smart to allow each jail to have its own
concept of 127.0.0.1 on a dummy interface mapped to all jails, that

it already have
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