To know that the email you have received from Kotak Securities is genuine, please check the sender address i.e. the "From" email address. The second half of the email address should be one of the following:
- kotaksecurities.co.in
- info.kotaksecurities.co.in
- services.kotaksecurities.co.in
- research.kotaksecurities.co.in
- nmail.kotaksecurities.com