What notices/orders can I respond to under e-Proceedings?
​​All notices/intimations/letters issued by the Income Tax Department and CPC are available under e-Proceedings, which you can view and submit the response along with attachments by uploading the same on the e-filing portal. You can view and submit responses to the following notices through this service:

Defective Notice under Section 139(9)
Intimation under Section 245 – Adjustment against demand
Prima Facie Adjustment under Section 143(1)(a)
Suo-moto Rectification under Section 154
Notices issued by Assessing Officer under Section 143(2)/142(1)/148
Seek clarification communication under Section 133(6)