Macro not trigger on cell value change

I have tried your code and it gives me error "Run-time error'1004':Application-defined or object-defined error" at below mention line:

 Call Mail(Target.Offset(, -11), Target.Offset(, -13), Target.Offset(, -6), Target.Offset(, -2))

also after updating the records its not clear contents of the form field.

Sixthsense,

Heads off to you, you are a life savior. The code works perfect as expected. Thank you very much for your time and resolution.

Thanks,