Re: [exim] Gmail's new 'suspicious sender' flag

On 7/11/11, Jeff Lasman <blists@???> wrote:
> I'm strongly considering automating taking all these IP#s and creating my
> own
> local DNS-based blocklist to run all company incoming email through, before
> checking other blocklists.
>
> Any opinions on that?

The first thing that came to mind is that plenty of the spam might
come from compromised but otherwise legit machines on dynamic IPs. So
blocking by IP would first block legit mails from the user of the
compromised machine and secondly a wholly innocent user who simply was
the next in line to get assigned the IP by the ISP.