qweasd         asdqwd@asd.org              256.62394383
qweasdczasd    asdghjghqwd@assssd.org      256.62394383
qwedddasd      asdasdaqwd@asd.org          256.62394383
qweavvvdsd     asaaadqwd@asccd.org         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