We have done it one, and you can also receive export payment in Indian Rupees. However take care that your buyer banker's correspondent bank in India , who will receive funds in Indian Rupees in India, will only be able to issue a FIRC (Foreign Inward Remittance Certificate), which is needed as proof of export. If you plan to send documents through bank, check with your bankers about it.
Vaibhav is right. Under Customs Act, export means sending goods outside India. Whether export proceeds are received in Foreign Exchange or not is not relevant.
However, under Foreign Exchange Mangement Act, you have to receive the export proceeds. Therefore, before exporting, you can approach your bank, take waiver of GR and export.