One should utilize the ITD’s official e-filing portal, log in to their account to verify notices using the Document Identification Number (DIN), as all valid notices will be posted and available there. “In case notice is received via email, you must check the email id of the sender. You must never provide any personal/bank details, etc., anywhere, even if asked through any mail, messages, or even calls. The department only corresponds through each taxpayer's login portal on their website, not from any other mode,” says Ritika Nayyar, partner, Singhania & Co.