Approve Link in mail notification takes user to intranet instead of generating a reply.

Summary:

When user clicks on approve link in email notication of approvals, it takes him to intranet, ideally it should generate a reply which if user sends, respective action should get performed. The user is using outlook, also this functionality works properly for other users, I assume this is related to some settings issue in outlook, i tried to search on internet but couln't find anything specefically. Kindly help.

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