Under Listing Agreement only Fax / Courier are the valid method of Corporate filing with Stock Exchanges. Howver recently Bombay Stock Exchange has also launched its listing site where the Corporate may  upload the compliance related documents.

Ttarget='_blank' rel='nofollow' hrefore the fax is the valid sourse, e mail may be done in addition to the fax. After that the document need to be send through Courier.

Online site is to be used in addion to above compliance.

As Mr. Srivastava stated, Fax and Courier are valid methods by which Corporate Filings can be done with the Stock Exchanges.

Additionally, NSE prefers its listed companies to use its 'NSE Electronic Application Processing System' (NEAPS) (www.connect2nse.com/LISTING/)for which they help create user accounts in the system for listed companies. This is similar to the Corporate Filing and Dissemination System (CFDS). It's very easy to use and NSE accepts it as compliance if you just submit it through NEPAS.

For BSE, in case of emergencies, Corparate Filing can be done by sending an e-mail to corp.relations @ bseindia.com. BSE also has a system similar to that of NEAPS and it can be accessed at https://listing.bseindia.com/