the Bombay High Court stated in Dr. Madhav Vishwanath Dawalbhakta & ors. v. M/s. Bendale Brothers that "the soul of the service is to have the information of the proceedings to the defendant or the contesting party.
2)
Justice Patel of the Bombay High Court endorsed the use of WhatsApp for notice delivery in an execution application in SBI Cards & Payments Services Pvt. Ltd. v. Rohidas Jadhav (2018). It was found that in addition to being received, the PDF attachment of the served notification had also been opened.
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3) having said that better send summons at physical address of parties
4) emails and whats app can be additional mode of service