New Ubuntu MTA now in use by new slogin server

The new slogin server will not send non-ASCII MH emails to the main Lab CentOS 5 MTAs, as they do not advertise that they support 8BITMIME. A Ubuntu 16.04 MTA which was being used for development has been brought into service, and slogin-new has been configured to use it.
It is believed that the system works, but do keep a closer eye on receiving copies of emails sent from slogin-new / svr-ssh-0.