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pkg-message

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+[
+{ type: install
+  message: <<EOM
+For postfix_exporter to read maillog, you need to chown it to maildrop group:
+chown :maildrop /var/log/maillog
+
+Also configure newsyslog to apply these rights when rotating log:
+/var/log/maillog        root:maildrop   640  7     *    @T00  JC
+
+Create postfix_exporter logfile with:
+touch /var/log/postfix_exporter.log && chown postfix_exporter /var/log/postfix_exporter.log
+EOM
+}
+]
+