Managing user_deny.db
*********************

The user_deny database allows you to deny access via POP/IMAP even if
the user can authenticate to the Cyrus server. For example, if the
authentication data is also used for other network services.

Use cyr_deny(8) to manage the database.

If the user_deny.db file doesn’t exist in %configdirectory% (often
/var/lib/imap) then you’ll need to create it. In the example below,
/var/lib/imap/ is used.

   # echo "" > /tmp/user_deny.flat
   # /usr/lib/cyrus-imapd/cvt_cyrusdb /tmp/user_deny.flat flat /var/lib/imap/user_deny.db skiplist
   # chown cyrus:cyrus /var/lib/imap/user_deny.db

The database specification can be found at User Access (user_deny.db).

   # su - cyrus
   $ cyr_dbtool /var/lib/imap/user_deny.db skiplist set **username** "2<tab>pop3<tab>Can't use pop."

Here *pop3* is the service name as spelled in cyrus.conf(5).  In order
to type a tab character, you will need to escape your tabs. In bash,
this is done by typing CTRL-v and then pressing Tab.

If you got it right, when you authenticate via pop3 you should see
something like the following:

   $ telnet mail.example.org 110
   Trying 192.168.0.2...
   Connected to mail.example.org.
   Escape character is '^]'.
   +OK mail.example.org Cyrus POP3 v2.4.17 server ready <18418688457439930663.1399062365@mail.example.org>
   USER **username**
   +OK Name is a valid mailbox
   -ERR [SYS/TEMP] Can't use pop.
   Connection closed by foreign host.
