I think it is not yet clear if assess is not found on address should this email communication treated as valid communication.
here is a intresting case law given for you kind perusal about the same :-
Assessment is invalid if notice under section 143(2) not served properly
In an interesting case, Assessing Officer served the notice u/s 143(2) to an assessee by registered post which was returned undelivered by postal authorities with the remark that “the said plot does not exist”. The address to which the notice was posted inadvertently missed an alphabet ‘B’ in the address, as a result of which the service of the notice could not be made by postal authorities.
In the instant case, the Assessing officer carried out ex-parte assessment and passed assessment order and demand notice.
It was discovered that the notice was issued by registered post at address given in return of income, i.e., B-226, Vivek Vihar, Delhi, however Alphabet ‘B’ was missing form the address to whom ITO posted the notice. The assessee insisted that since he was not delivered the notice in the time as stipulated in the income tax act, and hence assessment made by Assessing Officer was invalid.
The assessee contended that the assessment was invalid for the reason that no notice under section 143(2) was served on him within the time prescribed by the proviso to this section, as it existed at the relevant time. The commissioner (Appeal) obtained a remand report from the Assessing Officer and held that the statutory notice under section 143(2) having been issued on 25-10-2002, on the basis of address given in the return of income was within time and, therefore, the assessment could not be held to be invalid and, accordingly, he confirmed the assessment.
However, when assessee moved an appeal before ITAT, the Tribunal held that no notice under section 143(2) had been served on the assessee on or before 31-10-2002 and, therefore, the assessment was invalid.
Tribunal noted that the notice that was sent by registered post, which was received back undelivered with the endorsement “No Plot No.226 exists”. Thus, admittedly, notice under section 143(2) of the Act was not served upon the assessee. It may be pertinent to point out that alphabet “B” is missing in the endorsement made by the postal authorities. Thus, it stands established that the postman had not gone to “Plot No. B-226, Vivek Vihar, Delhi” because, his endorsement does not say “Plot No. B-226, Vivek Vihat, Delhi” does not exist.
More importantly, the tribunal noted that even otherwise, as per Order V Rule 19A of the Code of Civil Procedure, the notice sent by registered post ought to have been sent along with acknowledgement due but, admittedly the registered envelope was not sent along with acknowledgement due.
Accordingly the case was decided in favor of assessee.