In a Mailman + ISPConfig type of setup, you may get the following error while sending an e-mail to the mailing list:
When looking at the virtual aliases (in /var/lib/mailman/data/), the lists are empty.
You can resolve this by regenerating the aliases:
sudo /var/lib/mailman/bin/genaliases sudo postmap /var/lib/mailman/data/transport-mailman sudo postmap /var/lib/mailman/data/virtual-mailman
Afterwards, restart Postfix:
sudo service postfix restart
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