I have created a xls for my employer. It works absolutely fine on all the machine except only one machine.

It does not give me any error message on that particular machine. In fact When I check sent item on outlook it has the email also. But receiver does not receive the emails. I checked most of the things but could not find any problem. as it is working on all other machine its hard to pin point issue.. Here is the code i use.

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Please guide me on this if anyone has encounter same problem...
Thanks in advance.