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/usr/share/spamassassin/20_mailer-tests.cf is in spamassassin-rules-ja 9ubuntu1.

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# SpamAssassin rules file: mailer header tests
#
# Contact: Taku YASUI <tach at debian dot or dot jp>
# Please be aware that values are just my estimates and could be wrong.
# Use with care.
#
# Please don't modify this file as your changes will be overwritten with
# the next update. Use /etc/spamassassin/local.cf instead.
# See 'perldoc Mail::SpamAssassin::Conf' for details.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of either the Artistic License or the GNU General
# Public License as published by the Free Software Foundation; either
# version 1 of the License, or (at your option) any later version.
#
# See the file "License" in the top level of the SpamAssassin source
# distribution for more details.
#
###########################################################################

header X_MAILER_SPAM			X-Mailer =~ /(GpsMailer|SpireMail|IM2000 Version|Pinta Magazine|MultiMail|BSMTP DLL|E-Magazine|Direct Email|Achi-Kochi Mail|MagicalMail|InternetPost for Active Platform|Web Based Pronto|Super Mailer|MailDistributor|WinNT's Blat|Oshirase-Mailer|Easy DM free|DouhouHaishin|WsMail|Foxmail|mPOP Web-Mail|Paradise Fast Delivery Agent|fostering Program V Mail Client|TRICORN AUTOBAHN|IM2001|Gambler Bonuses|AdToOne|DM Mailer|SMTP Sender|DM-SenderEX|Douhou\@Mail|MailMagicPro|adToOne|MultiSneder)/
describe X_MAILER_SPAM			spammer's choice of X-Mailer
score X_MAILER_SPAM			2.8

header X_MAILER_U_SPAM			X-MAILER =~ /Mail Explorer For Internet /
describe X_MAILER_U_SPAM		spammer's choice of X-MAILER
score X_MAILER_U_SPAM			2.8

header X_MAIL_AGENT_SPAM		X-Mail-Agent =~ /(Extra Japan)/
describe X_MAIL_AGENT_SPAM		spammer's choice of X-Mail-Agent
score X_MAIL_AGENT_SPAM			2.8

header X_LIBRARY_SPAM			X-Library =~ /Indy/
describe X_LIBRARY_SPAM			spammer's choice of X-Library
score X_LIBRARY_SPAM			3.5

lang ja describe X_MAILER_SPAM		spam によく利用される X-Mailer です
lang ja describe X_MAILER_U_SPAM	spam によく利用される X-MAILER です
lang ja describe X_MAIL_AGENT_SPAM	spam によく利用される X-Mail-Agent です
lang ja describe X_LIBRARY_SPAM	spam によく利用される X-Library です