qweasd         [email protected]              256.62394383
qweasdczasd    [email protected]      256.62394383
qwedddasd      [email protected]          256.62394383
qweavvvdsd     [email protected]         256.62394383

# awk -F, '{print $1 "t" $2 "t" $3}' customers

# awk 'BEGIN{FS=","; OFS="t"} {print $1, $2, $3}' customers

# awk 'BEGIN{FS=","; OFS="t"} {print}' customers