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Reference: http://wiki2.dovecot.org/AuthDatabase/LDAP
aptitude install dovecot-imapd dovecot-pop3d dovecot-ldap
/etc/dovecot/dovecot-ldap.conf.ext:
hosts = localhost debug_level = 0 auth_bind = yes base = ou=qmail, o=mrzesty user_attrs = mailMessageStore=home=/var/qmail/maildirs/%$ user_filter = (&(objectClass=qmailUser)(uid=%u)) pass_attrs = mailMessageStore=home=/var/qmail/maildirs/%$ pass_filter = (&(objectClass=qmailUser)(uid=%u))
Activate fail2ban to block brute force attacks.
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