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/usr/share/spamassassin/25_accessdb.cf is in spamassassin 3.4.2-0ubuntu0.14.04.1.

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# SpamAssassin rules file: accessdb tests
#
# Please don't modify this file as your changes will be overwritten with
# the next update. Use @@LOCAL_RULES_DIR@@/local.cf instead.
# See 'perldoc Mail::SpamAssassin::Conf' for details.
#
# <@LICENSE>
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to you under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at:
# 
#     http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# </@LICENSE>
#
###########################################################################

ifplugin Mail::SpamAssassin::Plugin::AccessDB

# this code uses an access database (sendmail, postfix, etc.)
# Since you need to actively create an accessdb to use it, the plugin
# and rule is considered userconf and is disabled by default.
header		ACCESSDB eval:check_access_database('/etc/mail/access.db')
describe	ACCESSDB Message would have been caught by accessdb
tflags		ACCESSDB userconf
score		ACCESSDB 0

endif