My secondary server supports only DNS and mail. The secondary has its own /var/vmail tree and backup of mail* folders. There are mail items in the secondary that are unique to that system. That is, in the Maildir tree there are items with ID " '160...secondary.domain.tld...' ". These mail items appear to be notifications sent by [email protected] to [email protected]. But they were (sent and) received by the secondary system, the primary isn't getting them. Is there information somewhere about what we should expect in the secondary, what it should do and what it will not do, and how it should be working as a client in its own environment? I don't know what ISPConfig should be doing for us in this area. So I don't know if there is a configuration issue, or if it's expected that we should be doing something that I haven't found yet in any docs. Side note: The primary mail server saves backups as .zip. The secondary mail backups are .tar.gz. Bug or feature? Thanks!