Determinant of umask for sieve_pipe_bin_dir scripts?

Hi, What determines the umask of sieve_pipe_bin_dir scripts ? The results from my script are always being set to 0600. My script is simple and shown below, even if I adjust the right line to add " && chmod 644", the actual resulting file still remains at 0600 ?!?

#!/bin/bash

# Usage: imapsieve_copy <email>

MSG_USER="$1" MSG_TYPE="$2"

RUN_UUID=$(cat /proc/sys/kernel/random/uuid) BASE_DIR="/foo/bar" TARGET_DIR="${BASE_DIR}/${MSG_TYPE}" TARGET_FILE="${TARGET_DIR}/${RUN_UUID}"

cat > "${TARGET_FILE}" < /dev/stdin && pigz -9 "${TARGET_FILE}"