Hi,
look for the System Center Service Manager Connector for Exchange: https://www.microsoft.com/en-us/download/details.aspx?id=101579
"The Exchange Connector connects Service Manager to Exchange Server for processing incoming emails related to work items. Once the Exchange Connector has been configured to monitor Exchange mailboxes, you can use it to create and update work items based on templates specified by the administrator. By specifying special keywords to look for in the incoming emails, you can configure the Exchange Connector to perform actions like approving or rejecting review activities or enable activity implementers to mark activities assigned to them as completed."
Regards,
Stefan