Re: Continued probing with source IP 10.x.x.x

[James Lee Gromoll]

This could be your ISP. Try a traceroute and see if your first hop out of 
your gateway is on a 10.x.x.x net. I know some of the cable ISPs in the US 
use a 10.x.x.x subnet between their subscribers and the public networks. 
Ifthis is the case, your ISP is could be using the POP3 port to test for a 
server running contrary to the ISP policy. This would show up as a non 
frequent not too long a portscan.

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