Can a lawyer send legal notice through email?

yes there is no doubts and in future you will se many changes in court prodeeding and proucedure by electronic media

Hello, Greetings of the day!

Yes, lawyer can send a legal notice through email but it should be authentic. 
To get a clear picture of Mode to send a legal notice can refer this article:-

https://www.lawyersclubindia.com/articles/nitty-gritties-of-the-legal-notice--13837.asp

Hope it helps

Regards,

Sneha Jaiswal
 

RPAD, SPAD & e-mails must be enforced equally. The courts can sell 100₹ pdf formats, on which the petition can be typed and emailed.