If you find that the HR mailbox appears to be copied into self service requests, then please review within- 

Administration -> Company -> Settings -> Company Settings -> Notifications Heading 

Setting: Employee self service -> blind copy HR mailbox.

If this is set to Yes - The HR Mailbox entered will be blind copied into all system generated emails for Self Service requests. 

If these are not required, you can amend this to No and Submit to save.