39 postings between 18 Jul 2007 and 31 Aug 2007
Substantively identical, advertising the same service:
marlboro

Each posted to exactly one group. All together these are:
schule.admin
schule.allgemein
schule.informatik
schule.klassenfahrten
schule.lan+internet
schule.mathe
schule.naturwissenschaften
schule.schueler.forum
schule.schueler.schwatz
schule.software
schule.sprachen
schule.test

Extent of the spam:

BI BI2 ACI MESSAGE-ID
--------------------------------------------------
1.000 1.000 4
1.000 1.000 4
1.000 1.000 4 64.141.6.253>
1.000 1.000 4
1.000 1.000 4 <84155221731458665@142.82.148.2>
1.000 1.000 4
1.000 1.000 4 ucsd.edu>
1.000 1.000 4
1.000 1.000 4 <0ed0fi$6ny$4@canada.com>
1.000 1.000 4 comcast.net>
1.000 1.000 4 <822052788075842436824@185.191.244.81>
1.000 1.000 4 prodigy.net>
1.000 1.000 4
1.000 1.000 4 <130E77D0.19E29779@122.58.8.28>
1.000 1.000 4 yahoo.com>
1.000 1.000 4 <93PHu3uJ$Smj4M.7481056@gmail.com>
1.000 1.000 4
1.000 1.000 4 sprintmail.com>
1.000 1.000 4 <3uv2yq$1tu$5@houston.rr.com>
1.000 1.000 4 <3335584467680507801684@65.89.162.149>
1.000 1.000 4 juno.com>
1.000 1.000 4 excite.com>
1.000 1.000 4 <11321827760444801060232638@207.170.174.130>
1.000 1.000 4
1.000 1.000 4 <180FF358.A6D8ADF6@yahoo.com>
1.000 1.000 4 4ax.com>
1.000 1.000 4
1.000 1.000 4 att.net>
1.000 1.000 4 telus.net>
1.000 1.000 4 <87535435311665417225618@95.174.159.14>
1.000 1.000 4 4ax.com>
1.000 1.000 4 carolina.rr.com>
1.000 1.000 4 <51af916e.6ac12989@yahoo.com>
1.000 1.000 4 <07zUK5RJ$cIRg.3765226@harvard.edu>
1.000 1.000 4 <5vDEfzerh$vF6Y9.545428@peoplepc.com>
1.000 1.000 4 <3771568637136254@178.85.227.249>
1.000 1.000 4 <9A281453.BD4BB5DD@173.99.142.197>
1.000 1.000 4 4ax.com>
1.000 1.000 4 4ax.com>
--------------------------------------------------
39.000 39.000 156

According to http://schule.afaik.de/netiquette/netiquette.txt
the limit for the BI in schule* is 3.
Headers of one such posting:
Path: news.albasani.net!newsfeed.freenet.de!feeder.news-service.com!eweka.nl!hq-usenetpeers.eweka.nl!68.142.88.75.MISMATCH!hwmnpeer01.ams!hwmnpeer01.lga!news.highwinds-media.com!hw-filter.lga!newsfe19.lga.POSTED!53ab2750!not-for-mail
From: Retarded Dead Fucker sprintmail.com>
Message-ID:
Newsgroups: schule.test
Subject: B.U.Y...C.H.E.A.P__M_A_R_L_B_O_R_O___0x4B4gxiyyi
Lines: 32
Date: Fri, 31 Aug 2007 10:13:19 GMT
NNTP-Posting-Host: 70.176.77.12
X-Complaints-To: admin@cox.net
X-Trace: newsfe19.lga 1188557983 70.176.77.12 (Fri, 31 Aug 2007 03:59:43 MST)
NNTP-Posting-Date: Fri, 31 Aug 2007 03:59:43 MST
Organization: Cox