Managing user_deny.dbΒΆ

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.

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

Key: <Userid>

Data: <Version>TAB<Deny List (comma-separated wildmat patterns)>TAB<Deny Message>

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

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