Thank you very much; I certainly have an AmavisD setup (Spamassasin, ClamAV AntiVirus, etc.) behind this; I am just trying to cut down on false positives while making as little a disruptive change as possible to the end user.
I will try out your suggestion on #2. Thanks again. Regards, Christopher Kurtis Koeber -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Wietse Venema Sent: Wednesday, September 18, 2013 9:46 PM To: Postfix users Subject: Re: Greylist Based on Error Code and 'org' Domain? Christopher Kurtis Koeber: > Hello, > > I am wondering if it is possible to greylist email systems based on: > > 1. An error code (450 Helo Command Rejected: Host not Found). This is currently not supported. It would require a DNS-based lookup table. Instead, consider using a good DNSBL. > 2. If they are a 'org' domain. I hope that is just an example, and not a serious spam blocking strategy. /etc/postfix/main.cf: smtpd_mumble_restrictions = ... check_client_access hash:/etc/postfix/client_access /etc/postfix/client_access: unknown check_policy_service name-of-greylist-daemon-here Many spambots don't have a usable client name (i.e. the FCRDNS lookup fails) so Postfix uses a clientname of "unknown". Wietse
