To link customer e-mails with cases, you need to do the following configuration steps in SAP Service Cloud Version 2:
Maintain and activate at least one e-mail channel: You need to create an e-mail channel for each support e-mail address that you want to use to communicate with your customers. You also need to configure the settings for the e-mail channel, such as the technical e-mail address, the sender name, the sender e-mail address, and the reply-to e-mail address. You also need to verify and activate the e-mail channel, so that the incoming e-mails are forwarded from your company's e-mail server to the tenant's technical e-mail address.
Create a case routing rule: You need to create a case routing rule for each e-mail channel, to define how the incoming e-mails are processed and assigned to cases. You can specify the criteria for the case routing rule, such as the e-mail channel, the sender e-mail address, the subject, or the body of the e-mail.
You can also specify the actions for the case routing rule, such as creating a new case, updating an existing case, assigning a case type, assigning a team or a processor, or sending an auto-reply e-mail. References = Configuring Email, section Communication Channel Configuration - Email; Providing Expedited Service, section Inbound Email Linked to a Case.