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This setting is by default set to 2.0 which causes the spam headers only to be added when the score is above that value.If you want the header to be always included, this needs to be set to a high negative value.This is also the default location as it is configured in Cent OS. Postgrey will reject emails with a temporary error code when received for the first time.To identify the sender the triplet CLIENT_IP / SENDER / RECIPIENT is used.When the email is passed on to amavisd-new, an additional “Received” header is added to the email.If you don’t want to show this information on outgoing emails, the following configuration added to the /etc/configuration file will avoid these headers being added.
For more options, please check the manual page available on your server via “perldoc postgrey“.
When the sender retries to deliver the mail, Postgrey accepts it. To configure Postgrey on a Cent OS server, create the file /etc/sysconfig/postgrey and open it with your favourite editor. This line will contain all configuration options for the Postgrey daemon.
These options will instruct Postgrey to delay the delivery of the email by 60 seconds.
To instruct postfix to ask the Postgrey policy server, the highlighted item needs to be added to the “smtpd_recipient_restrictions” configuration of the /etc/postfix/config file.
The unix socket shown above for the Postgrey policy server will be configured in the next step. It counts on the non-RFC conformant behaviour of spam mail servers.