On 20.5.2013, at 11.29, Roel Wagenaar <r...@wagenaar.nu> wrote: > I am cleaning up some old users, and found that in every maildir folder there > is > an empty file called maildirfolder, created at the time the original dovecot > was > installed. > > Is this empty file necessary for dovecot, or is it left there in an upgrade > proces and can it be removed?
It's defined by Maildir++ specs. They're used by maildrop and maybe some other Maildir++ tools that need to update the maildirsize quota file. Dovecot itself doesn't care about if they exist or not, but it does create them whenever you create a new folder, so you can't really get rid of them completely.
