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Rhel5 Postfix installations support the ‘mbox’ mailbox typically found in ’/var/spool/mail’ This default behavior can be changed to ‘Maildir’ if desired.

(You cannot revert back to ‘mbox’ once you have opted to change to Maildir, and you cannot switch back to Sendmail without losing all messages stored and delivered.)

postconf -e home_mailbox="Maildir/" 
postconf -e local_recipient_maps="unix:passwd.byname $alias_maps" 
postfix reload

These changes are required as per the following settings outlined in “/etc/postfix/main.cf”

---# REJECTING MAIL FOR UNKNOWN LOCAL USERS
#
# The local_recipient_maps parameter specifies optional lookup tables
# with all names or addresses of users that are local with respect
# to $mydestination, $inet_interfaces or $proxy_interfaces.
#
# If this parameter is defined, then the SMTP server will reject
# mail for unknown local users. This parameter is defined by default.
#
# To turn off local recipient checking in the SMTP server, specify
# local_recipient_maps = (i.e. empty).
#
# The default setting assumes that you use the default Postfix local
# delivery agent for local delivery. You need to update the
# local_recipient_maps setting if:
#
# - You define $mydestination domain recipients in files other than
#   /etc/passwd, /etc/aliases, or the $virtual_alias_maps files.
#   For example, you define $mydestination domain recipients in
#   the $virtual_mailbox_maps files.