<h1>ITR V submission: final opportunity to mail unsigned e filed returns to CPC to enable processing and refunds.</h1> Electronically filed returns submitted without a digital signature must be regularized by mailing the signed ITR V by ordinary or speed post only to the Centralized Processing Center (CPC) in Bengaluru; taxpayers who filed ITR V locally or who did not receive CPC acknowledgement should re mail the ITR V. The CPC must acknowledge receipt of the ITR V for the Department to process the return or consider refunds; returns without such acknowledgement will be treated as not filed.