This is very similar to a thread I posted on Ubuntu Forums a week ago that hasn't been resolved:
http://ubuntuforums.org/showthread.php?t=2001283 This is my configuration as of today, but this particular e-mail system is not enabled by my router yet; no port traffic is directed to this machine so I have to test via telnet. http://www.timothylegg.com/master.cf.txt http://www.timothylegg.com/main.cf.txt I have been following a HOWTO on the Ubuntu Site, https://help.ubuntu.com/community/PostfixBasicSetupHowto to help me setup my server correctly, and also help me understand exactly how postfix works. The documentation at postfix.org has already been helpful for me. This HOWTO includes setting up Courier, so there is the expectation of using the Maildir format. For 15 years, I have used mbox, but I have decided to migrate. There is a section that states "Instruct Postfix to use Maildirs instead of Mboxes: " % sudo postconf -e "home_mailbox = Maildir/" And I have done that, however when I telnet to my server to test this, I get a file called Maildir instead of Maildir/ This file is of zero length. # postconf home_mailbox home_mailbox = Maildir/ Here, it appears to be correct. But in the user's directory, I get this: -rw-r--r-- 1 fmaster fmaster 3486 Apr 3 10:58 .bashrc -rw------- 1 fmaster fmaster 0 Jun 10 17:19 Maildir -rw-r--r-- 1 fmaster fmaster 675 Apr 3 10:58 .profile