https://github.com/thecamels/zabbix/issues/7

zabbix_agentd.conf.d/postfix.conf

+UserParameter=postfix.version, postconf -d mail_version | cut -d '=' -f 2 | tr -d " "
+UserParameter=mailqueue-postfix,mailq 2>&1 | grep -v 'Mail queue is empty' | grep -c '^[0-9A-Z]'
+UserParameter=mailqueue-postfix-queue[*], sudo find /var/spool/postfix/ -type f | grep $1 | grep -v -e "/pid/" -e "/defer/" | wc -l
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