Install Courier-IMAP
Install Courier-IMAP
#cd /root/postfixrocks/
#tar -jxvf courier-imap-4.7.0.tar.bz2
#cd courier-imap-4.7.0
#./configure
#make && make install
Edit Imapd
#vi imapd
#### modify few lines below ###
#### Change it from 1 to 0
IMAP_MAILBOX_SANITY_CHECK=0
### change it from no to yes ###
IMAPDSTART=YES