you can send it by any which way...speed or Registered or Ordinary... As long as you have the record of the shareholders to whom it is sent, any mode of sending is fine...
The notice of meeting to the members of the company and persons entitled to share in consequence of the death or insolvency of a member, can be sent by a company by any of the manner as per provisions of section 53 of the Companies Act, 1956. Notice may be served in the following manner:— (a) Personal service. (Hand delivery) (b) Sending at the registered addresses of the person entitled to receive the notice by post under a certificate of posting. (UPC)(now not applicable) (c) Sending at the registered addresses of a person entitled to receive notice by registered post. (d) Sending at the registered addresses of a person entitled to receive notice by other means as prescribed in the Articles (by courier or e-mail). (e) In the case of persons having no registered addresses in India, the documents including notice shall be sent:— (i) to the address, if any, within India supplied by them to the company for giving notices to them; or (ii) by advertising it in newspaper circulating in the neighbourhood of the registered office of the company. (f) Notice to the person entitled to shares in consequence of the death or insolvency of the member shall be sending it through post in a pre-paid letter addressed to them by name or by title of representatives of a deceased or assignee at the address, if any, supplied for the purpose by the person claiming to be so entitled or until such an address has been supplied by giving the notice in any manner in which it might have been given if the death or insolvency had not occurred. (g) A document may be served by the company on the jointholders of a security by serving it on the jointholders named first in the register in respect of the seniority. Section 53(2) further provides that the service of a notice for a general meeting shall be deemed to have been effected at the expiration of 48 hours after the same is posted.