spf

I run Dmarc, SKIM, SPF on all my emails, so I run Dmarcian to monitor all outbound emails... and there are at least a few emails a day coming from China on nxdomain.. random ips, etc... How can I stop these... Can I publish a Dmarc policy for example to stop everything from China? or just...

Recently, my laptop is having a bit of trouble connecting to a wired connection. Wireless works fine, but wired connection is always having this "Local area connection doesn't have a valid IP configuration" "The default gateway is not available" error. After I run the troubleshooting it says...