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GhanesanGhanesan 

How to add signature block for manager in Attached PDF on VisualForce Classic Email Template

SwethaSwetha (Salesforce Developers) 
HI Ganesan,
Does https://www.matchmyemail.com/adding-email-signatures-in-salesforce/ help?

You might also want to try the approach of using custom label having the user signature in the classic email template.
See https://salesforce.stackexchange.com/questions/95828/how-to-use-custom-labels-in-email-templates

Thanks