Postfix-mbox-to-Maildir-format-conversion.txt

Postfix mbox to Maildir format conversion
Often by default, postfix is configured to deliver email messages in mbox format. To convert mbox to Maildir

1. Edit /etc/postfix/main.cf and look for a line

# "Maildir/" for qmail-style delivery (the / is required).
home_mailbox = Maildir/

2. if procmail is used by postfix to deliver locally change /etc/procmailrc add a line 
DEFAULT=$HOME/Maildir/

3. restart postfix

4. for new users to have Maildir/ after creation do


mkdir -p /etc/skel/Maildir/new
mkdir -p /etc/skel/Maildir/cur
mkdir -p /etc/skel/Maildir/tmp
5. convert all existing users to Maildir format using an effect perl script from qmail.org download it at http://www.qmail.org/convert-and-create

wget -c http://www.qmail.org/convert-and-create
then run it

sh convert-and-create
Note: for dovecot no need to change anything, it will autodetect mail box formats, very cool.