Bash script for checking linux service status and sends mail if its down

servicechecker.sh

declare -a SERVICES=(
nginx
mysql
testservice
)

for i in "${SERVICES[@]}"; do

systemctl is-active --quiet "$i" && STATUS="active" || STATUS="notactive"
if [ "${STATUS}" = "active" ]; then
        echo ""
else
        echo "SERVICE $i IS NOT ALIVE! FIX IT!" | ssmtp emailaddress@gmail.com
        exit 1
fi
done