/etc/aliases.db missing after installation
"/var/log/mail.err" gets populated with many "chat postfix/smtps/smtpd: error: open database /etc/aliases.db: No such file or directory" entries, due to the fact that this file is missing.
The installation routine should include a "newaliases" command.
I moved /etc/aliases.db to /root/ on c2.testrun.org, so we can check whether the error appears there as well.
meanwhile, /etc/aliases.db was created on c2 automatically. /var/log/mail.err wasn't even created though; so I can't reproduce the issue.
Which linux distribution and which postfix version are you running?
this seems to be stale. If /etc/aliases.db: no such file or directory happens again, let's create a new issue.