apt-get install postfix


# http://www.postfix.org/VIRTUAL_README.html#virtual_mailbox
# https://help.ubuntu.com/community/PostfixVirtualMailBoxClamSmtpHowto


# http://wiki2.dovecot.org/HowTo/VirtualUserFlatFilesPostfix


root@web:~# apt-get install dovecot-core dovecot-imapd dovecot-pop3d dovecot-lmtpd dovecot-sieve