Late last year I tried the Postscreen "deep protocol tests" as a primitive form of greylisting; It was a high-maintenance exercise for minimal benefit and I have since stopped using it.
Google and the like, use a different mail server for each connect attempt. You need an actively maintained whitelist to bypass the grey-list process. Also, (in my case) I was plagued by Ukrainian spamming mail servers; they just retried and got through. The experiment DID stop a few zombies, but not many. Allen C On 12/03/18 02:39, john wrote: > I was just taking a look through my postfix configuration and noticed > that I have a "check_policy_service" for postgrey a greylisting service. > > I greylisting still considered worthwhile or should I drop it? > > TIA > > John A > > >
