> On 2016-06-08 17:59, Phil Stracchino wrote: > > This may not work for you, but I reject all incoming mail connections > directly from Windows hosts at my firewall. They are overwhelmingly > likely to be botnet spam zombies. If it's a legitimate mailserver, it > will fall back through my backup MX. If it doesn't, the odds are I > didn't want the mail anyway. >
how do you distinguish Windows connections from non-windows in your firewall ?
