Ooops. I forgot to mention one other little tweak that may be useful
for educational purposes (not to mention it's prettier than sed).
Instead of:
sed -i "s/#myhostname = host.domain.tld/myhostname = \
[localhost.localdomain]/" /etc/postfix/main.cf &&
use:
postconf -e "myhostname = [localhost.localdomain]" &&
--
Archaic
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