/^X-Spam-Score: -.*/
        PREPEND X-SCL: -1
# 0-3 = 0-3
/^X-Spam-Score: ([0-3])(\.|[[:space:]]*$)/
        PREPEND X-SCL: $1
# 4-5 = 4
/^X-Spam-Score: [4-5](\.|[[:space:]]*$)/
        PREPEND X-SCL: 4
# 6-9 = 5
/^X-Spam-Score: [6-9](\.|[[:space:]]*$)/
        PREPEND X-SCL: 5
# 10-19 = 6
/^X-Spam-Score: 1[0-9](\.|[[:space:]]*$)/
        PREPEND X-SCL: 6
# 20-29 = 7
/^X-Spam-Score: 2[0-9](\.|[[:space:]]*$)/
        PREPEND X-SCL: 7
# 30-39 = 8
/^X-Spam-Score: 3[0-9](\.|[[:space:]]*$)/
        PREPEND X-SCL: 8
# 40+ = 9
/^X-Spam-Score: [4-9][0-9].*/
        PREPEND X-SCL: 9