On Mon, 3 Jun 2013 14:34:30 -0500 (CDT)
David B Funk <dbf...@engineering.uiowa.edu> wrote:

> Do you not like connection-oriented RBLs? That client IP address is in
> both cbl.abuseat.org & pbl.spamhaus.org lists as an infected client.

We run an anti-spam service for about 100K users and sell appliances
that filter for many more.  Paying for RBLs is not cost-effective at
that scale.

> Why not just block connections from infected PCs?

Sure, we could.  I just thought the spams were unusual and wondered
if anyone knew the motivation behind them --- it's not that they were
getting past our filters; I just found them curious.

Regards,

David.

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