请翻译成英文：我汇款后不必传真汇款单了，是吗？

I don't need to fax the invoice to you after remittance, right?

我汇款后不必传真汇款单了，是吗？

Shall I presume that, after teh remittance, I won't need to send you the remittance instrument by fax ?

I don't need to send the fax of remittance bill after remitting the payment, do I?