Removing Focus
The final rule set
4 also removes angle brackets inserted by the
canonify rule
set 3 to focus on the host part of the address. This
is necessary because they are used only by the
internal logic of the configuration file. If they
were mistakenly left in place, mail would
fail:
# externalize local domain info R $* <$+> $* $1 $2 $3 defocus
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