02 October 2014
apart from the email part, the notice if addressed to Shimla address instead of Delhi address (as provided in the return) can be considered as wrong. you may refer to Mumbai ITAT judgment in the case of Shri Prakash Ramji Gavali The Income Tax Officer Ward 3(1)ITA No.1492/Mum/2012 : Asst. Year 2008-2009
However, you may note that in past judicial authorities have held even delivery of notice vide fax as valid. You may refer M/s SIL Import, USA v. M/s Exim Aides Silk Exporters, AIR 1999 SC 161213
regardless any notice to be valid should atleast have the propery seal of the department as Kumar ji said
03 October 2014
Balakrishnan..143(2) notice doesnt have digital signatures..it is always signed in person...143(1) intimations are digitally signed...and even for 143(1) intimations only where return is filed online, the intimation shall be digitally signed...returns filed with AO in physical mode shall have physical 143(1) intimation with physical signature and the seal.