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[Unit]
Description=Exim get queue size

[Service]
Type=oneshot
ExecStart=/usr/bin/bash -c "/usr/sbin/exim -bpc|head -1 > /etc/exim/queue_size"
ExecStartPost=/usr/bin/bash -c "/usr/bin/awk '($1 > 10000) {exit 1}' /etc/exim/queue_size && rm -f /etc/exim/queue_full || /usr/bin/touch /etc/exim/queue_full"