added dovecot filter

dovecot.conf

@@ -0,0 +1,23 @@
+# Fail2Ban configuration file
+#
+# Author: Cyril Jaquier
+#
+# $Revision: 728 $
+#
+
+[Definition]
+
+# Option:  failregex
+# Notes.:  regex to match the password failure messages in the logfile. The
+#          host must be matched by a group named "host". The tag "<HOST>" can
+#          be used for standard IP/hostname matching and is only an alias for
+#          (?:::f{4,6}:)?(?P<host>[\w\-.^_]+)
+# Values:  TEXT
+#
+failregex = dovecot: auth-worker\(default\): sql\(.*@.*,<HOST>\): Password mismatch
+
+# Option:  ignoreregex
+# Notes.:  regex to ignore. If this regex matches, the line is ignored.
+# Values:  TEXT
+#
+ignoreregex =