PLO requires a return address. We recommend that is a generic address, like I mentioned earlier. That address is forwarded to a real person(s), so turnover is easy to handle.
Strictly speaking, the records of emails sent should show up in CRM history table. We haven't done this, but you should be able to arrange this with Sage CRM by copying the email to an address received by Exchange Server, which then integrates into Sage CRM. It could also be managed by receiving the email in KnowledgeSync and run a process to add it to the CRM customer record.
But nothing out of the box.