On Mon, Nov 23, 2015 at 1:48 PM, rob...@chalmers.com.au < rob...@chalmers.com.au> wrote:
> Interesting article Steve. What happens when/if they change ip blocks in > between cron runs? > and I can't help thinking this may be a little redundant though, with spf, > dkim and dmarc in place the source of the email is checked and acted upon > accordingly. > Hi, Robert. As Noel pointed out, this all occurs way before SPF, DKIM, and/or DMARC come into play. As for what happens if they IP blocks change between cron runs, a spammer would have to take control of an old Google or Microsoft netblock in order to increase any risk, which is unlikely. And since this is a whitelist, any new IPs that haven't been picked up in the no more than 7 days since the last query would be evaluated by Postscreen per normal... and would likely still get through.
