Email entered wrongly while filing the returns

Don't worry the communication will be made by the department on your registered contact details , so mistake in ITR details will not matter...

Thanks a lot for the info Sourabh Maheshwari. 

I just found an option in www.incometaxindiaefiling.gov.in that it is allowing to change the ITR particulars form which comes under E-File menu > Change ITR Form Particulars. The changes will not reflect in the ITR. but the information will only be used for processing.