スパム書き込みが多いですね。
私は対策として、拒否ホスト、拒否アドレスを設定しているんですが、そのホスト、アドレスがどんどん増えていきます。

スパム書き込みがあったホスト、IPアドレスを書いておきますので、スパム対策をしたい方は参考にしてください。

スパムを書き込むことが多いホスト名は、

*.oska.nt.ftth4.ppp.infoweb.ne.jp
*.osk.mesh.ad.jp
*.ppp11.odn.ad.jp
*.hsd1.wa.comcast.net
*.ap.gmo-access.jp
*.kcn.ne.jp
*.p-osaka.nttpc.ne.jp
*.foebud.org
*.onlinehome-server.info
*.ap.yournet.ne.jp
*.ap.cyberbb.ne.jp
*.lab.os3.nl
*.blutmagie.de
*.bu.edu
*.digineo.de
*.dy.bbexcite.jp
*.west.bflets.alpha-net.ne.jp
*.info-com.ru
*.server4you.de
*.coevoet.nl
*.onlinemartin.org
*.privacyfoundation.de
*.aof.su
*.kimsufi.com
*.stratoserver.net
*osakakita.osaka.ocn.ne.jp
*.ghst.net
*.mant.nc.charter.com
*.na.cust.bahnhof.se
*.oska.nt.adsl.ppp.infoweb.ne.jp
*.a027.ap.plala.or.jp
*.saitis.net
*.washdc.fios.verizon.net
*.vectant.ne.jp
*.osaka-ip.dti.ne.jp
*.twbbs.org
*.pool.ukrtel.net
*.priv.bahnhof.se
*.static.corbina.ru
*.ppp.u-netsurf.ne.jp
*.n01d.com
*.rr.com
*.all.de
*.bredbandsbolaget.se
*.nienschanz.ru
*.oska.nt.ftth.ppp.infoweb.ne.jp
*niigatani.niigata.ocn.ne.jp
*.fejk.se
*.bstnma.fios.verizon.net
*.oc.oc.cox.net
*.dhcp.dbnet.dk
*.christiania.org
*.cpe.net.cable.rogers.com
*.cb3rob.net
*.tyknet.dk
*.corp.bahnhof.se
*.united-hoster.de
*.vie.surfer.at
*.bbse.no
*.trit.net
*.wku.edu
*.telesp.net.br
*.hosteurope.de
*.eicat.ca
*.cyberservice.net
*.ellenburg.net
*.s04.a040.ap.plala.or.jp
*.fios.verizon.net
*.osaka.sannet.ne.jp
*.ziggo.nl
*.br-hosting.com
*.vivi2.kapper.net
*.ono.com
*.wideopenwest.com
*.podgorny.cz
*.lostinthenoise.net
*.osaknt01.ap.so-net.ne.jp
*.sharkeen.lt
*.zagbot.com
*.abo.wanadoo.fr
*.i-revonet.jp
*.suddenlink.net
*.ccc.de
*.netelligent.ca
*.virginmedia.com
*.ownit.se
*.com.ua
*.ctbctelecom.com.br
*.kabel-badenwuerttemberg.de
*.t-dialin.net
*.aibohphobia.org
*.dy.iij4u.or.jp
*.riseup.net
*.de
*.dmnet.ru
*.comcast.net
*.atw.hu
*.uaic.ro
*.net.my
*.telconet.net
*.linode.com
*.telia.net
*.ackley.net
*.zerd.net
*.dslextreme.com
*.flets.hi-ho.ne.jp
*.corbina.ru
*.gnupg.org
*.co.uk
*.cloud-ips.com
*.robert-marquardt.com
*.perspektivbredband.net
*.torservers.net
*.torservers.net
*.ax.lt
*.dsn.jp
*.cableone.net
*.chaos-disciple.org
*.ac.uk
*.formlessnetworking.net
*.uk2net.com
*.alpha-net.ne.jp
*.globetrotter.net
*.vips.gol.ne.jp
*.cefetgo.br
*.kashpureff.org
*.helpion.cz
*.omegamicro.net
*.lovesensationstyle.com
*.bombsquad.org
*.lastmilebroadband.ie
*.com.br
*.ipq.jp
*.ne.com.sg

IPアドレスは

66.230.230.*
219.140.165.*
117.25.130.*
78.142.140.*
91.198.227.*
212.50.162.*
193.37.152.*
192.251.226.*
193.188.70.*
93.186.171.*
83.91.86.*
189.17.85.*
80.148.*
210.51.*
188.27.*
77.73.*
217.114.*
202.103.*
173.212.*
189.77.*
120.50.*
189.22.*
77.207.*
217.196.*
188.72.*
82.223.*
117.102.*
61.19.*
87.100.*
178.120.*
80.73.*
91.209.*
222.161.*
80.81.*
212.116.*
69.1.*
201.91.*
121.8.*
202.67.*
79.165.*
189.42.*
88.198.*
66.90.*
89.248.*
124.42.*
74.63.*
61.82.*
174.142.*
58.147.*
108.101.*
78.46.*
58.120.*
188.208.*
119.62.*
89.111.*
202.51.*
211.138.*
81.218.*
222.58.*
174.138.*
85.17.*
64.62.*
222.124.*
187.19.*
161.184.*
190.69.*
124.80.*
87.118.*
200.35.*
200.183.*
180.149.*
124.217.*
194.154.*
92.241.*
208.6.*
212.12.*
137.56.*
201.72.*
118.98.*
77.235.*
187.16.*
202.201.*
202.57.*
114.142.*
202.133.*
187.111.*
85.113.*
109.169.*
196.201.*