common SPAM

hello

anyone else is getting SPAM with subject "Re: n notice 84 51"? in fact I noticed the first letter (after "Re:") changes, "notice" can be "news" and the other numbers after changes too
but it's almost always the same pattern:
Re: n notice 84 51
Re: 9 notice 29 0
Re: w notice 60 61
etc...

I started to get this E-Mail around 20 times a day on my postmaster address... I checked the headers and found it was being sent from my servers (probably because I'm configured as postmaster)
I could find things like that on log:

2006-02-07 02:51:57 1F6KpY-0001rA-45 <= wiseli@koll.com H=(koll.com) [210.213.235.228] P=smtp S=5480 id=000001c62ba2$28534540$f936a8c0@legate T="Re: F notice 53 57" from <wiseli@koll.com> for contato@XXXX***********
2006-02-07 02:52:47 1F6KqM-0001sZ-1q <= buec@kktc.net H=(kktc.net) [60.20.112.43] P=smtp S=5471 id=000001c62ba2$28534540$f936a8c0@legate T="Re: F notice 53 57" from <buec@kktc.net> for contato@XXXXXXXXXX.net
2006-02-07 08:16:55 1F6Pu3-000GPr-68 <= levialightca@isi.inet.fi H=200-206-137-7.dsl.telesp.net.br (isi.inet.fi) [200.206.137.7] P=smtp S=5525 id=000001c62bcf$8300a500$7042a8c0@streaky T="Re: h notice 30 68" from <levialightca@isi.inet.fi> for aline@XXXX***********.br

what I find strange is that they're being sent for many customers in 2 of my servers... or someone found the domains hosted on my server or is heavly spamming everything they can find
any hints on what else I could check?

thanks

 

 

 

 

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