ZCS Administrator Guide 8.0
ZCS Administrator Guide 8.0
Open Source Edition

Managing ZCS Configuration > Protect Alias Domains from Backscatter Spam

Protect Alias Domains from Backscatter Spam
To reduce the risk of backscatter spam, you can run a milter that runs a Postfix SMTP Access Policy Daemon that validates RCPT To: content specifically for alias domains.
zmlocalconfig -e postfix_enable_smtpd_policyd=yes
postfix stop
zmprov mcf +zimbraMtaRestriction "check_policy_service unix:private/policy"
postfix start
The postfix_policy_time_limit key is set because by default the Postfix spawn (8) daemon kills its child process after 1000 seconds. This is too short for a policy daemon that might run as long as an SMTP client is connected to an SMTP process.
Copyright © 2012 VMware Inc.