Service through electronic mode accepted where members are given opportunity to register emails; otherwise other modes apply. Service through electronic mode satisfies Section 53 of the Companies Act where the company has obtained members' e mail addresses after giving each shareholder an advance opportunity to register and update those addresses. If a member has not registered an e mail address, service must be effected by other modes authorised under Section 53. The clarification relies on the Information Technology Act for legal validity and responds to discontinuation of the postal 'certificate of posting'.