Hi @D Vijayakumar VLR ,
if I get your question right, you want to sent an email with ServiceNow details automatically.
If so, this automation should be handled by ServiceNow and not via PowerShell. And as ServiceNow is not a product of Microsoft I would recommend to ask in a ServiceNow related forums.
(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)