The provided search results do not mention an "Harshith Institute". It's possible there's a typo in the name or the institute is not widely listed online. It is recommended to double check the name or the type of institute you are referring to before searching for its email. If referring to IBT Institute, their email address is headoffice@ibtindia.com. If referring to Learning Planet Institute, their international student support email is international-student-support@learningplanetinstitute.org.