One of my auxiliary mail servers is having trouble after an upgrade. postfix can't read the hash tables of its databases. I tried a new aliases file and when I run newaliases the system complains that it can't find dictionary type and asks if the package postfix-hash is installed.
I can't find such a package or anything like it.
https://bbs.archlinux.org/viewtopic.php?id=294782
Yes, this was a questionable update/deprecation from postfix. We got ourselves some offline interval in email operations too.
Wietse is usually pretty solid. It is not like him to do things without a cause.