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  Postfix Spam Filter Reports: Why Email Reports?
    The most critical function of a spam filter is not simply to eliminate spam but to do so and not filter legitimate mail. Identifying false-positives is key to effective spam management and acceptance by email recipients.

    The only reliable way to avoid false-positives is by A) monitoring the email server or gateway logs, and B) allowing end-users to receive a daily report of email identified as spam and filtered.

    Daily reports are automatically enabled in /etc/crontab if you specified mailed reports during installation. The default is the server domain's postmaster account. To add or change email recipients:
        vi  /usr/postconf/bin/spamrep_today

    Look for the MAILTO line:
         MAILTO=postmaster

    and define it per your domain:
         MAILTO=abuse,joeadmin,saramanager

    To do the same for individual, by-user recipients:
        vi  /etc/postfix/reportrecipient

    and add one email recipient address per line:
        abuse
        saramanager
        joeadmin

Other free utilities:
    mq         formats the output of Postfix' mailq command
    txt2rbl       converts text ip address blacklists to DNS RBL zone files
    txt2rhsbl     converts host/domain blacklists to DNS RHSBL zone files
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