I'm running Postfix 3.1.0 on an Ubuntu 16.04 LTS system. II'm using Postfix's postscreen filtering, including zen.spamhaus.org (with a large score) as one of my DNSBL sites, but it's not helping in some cases because the spam sources are not showing up on Spamhaus at the time I get e-mail from them -- only later on.
I'm wondering if it may be worthwhile for me to enable greylisting in some form on my server. I'm aware of Postgrey, but I'm uneasy because this package seems to get updated so rarely (the latest version is about three years old). I see the Postfix configuration docs (www.postfix.org/postconf.5.html) propose using address_verify_poll_count=1 as "a crude form of greylisting"; how well do people find this to work in practice? Any other suggestions? Rich Wales ri...@richw.org
