The following lines were added (+) and removed (-):
Note the virtual_mailbox_base parameter. This is where mail for virtual users is delivered to and stored. This mail is kept separate from mail for system users. Since we are using Maildir/ style mailboxes, for each user postfix will deliver to the proper Maildir structure under /var/spool/vmail . The first time an email is delivered, and the structure under /var/spool/vmail does not yet exist for the user, postfix will create the directories. It is important that postfix have write permission to the /var/spool/vmail folder. Another important consideration is that later, when we configure dovecot so users can pop or imap in to read their mail, it use the same path for mail_location.