S. 144B : Faceless Assessment –Best judgment assessment -Reassessment – Assessment order passed without granting the assessee a fair and effective opportunity of hearing is liable to be quashed- Where statutory notices are not effectively communicated to the assessee’s registered e-mail addresses, the assessment is vitiated for breach of principles of natural justice. [S. 143(2), 144, 148, 156, 282,ITAT R.127, Art . 226 ]