Comment 7 for bug 2019195

Note that we see the autopkgtest failure only when postfix is installed as a (test-)dependency of some other package. Interestingly postfix own autopkgtest does not fail. This is because postfix is not installed as a test dependency, but "manually" by the d/t/postfix script:

# reconfigure postfix
debconf-set-selections <<< "postfix postfix/mailname string localhost" 2>&1
debconf-set-selections <<< "postfix postfix/main_mailer_type string 'Internet Site'" 2>&1

# install and modify
hostname localhost
apt-get install -y postfix 2>&1