This document is an attempt to explain some of the fairly intricate processes that run on Nexus is an attempt to manage an issue called 'split routing'. Split routing is where mail sent from Nexus ends up in a different place from mail sent from outside Nexus. It is aimed at IT Services Help Centre Staff and ITSS. We don't pretend it is easy. Remember all addresses associated with a nexus account will be an Oxford controlled address.
1. Default setup
If someone is logged onto Nexus using Outlook via MAPI, or OWA and sends to
firstname.lastname@example.org appears on an account on Nexus (ie the
Sending address), then the message wont go out to the Oxmails but will be delivered
directly to the Nexus account
fluff0001. (There is no way for Exchange to
work in any other way- it cant be forced to send mail to the oxmails.)
As long as in the mailer tables
email@example.com routes to
fluff0001@nexus then mail sent from outside Nexus will also end up in the
fluff001@nexus and all is well. The mailer routings are visible in the
Mail Routing tab in WebReg , and ITSS's https://register.it.ox.ac.uk/itss/mail_routing
2. Routing changes
What happens when Fluffy asks for
firstname.lastname@example.org to route
email@example.com and not to Nexus at all?
HelpCentre/ITSS change the routing for the OxMails
firstname.lastname@example.org goes to
what happens to mail sent from people on Nexus? It still goes to
fluff0001@nexus and Fluffy's mail is in two places!!!
fluffy.brown@spiresnow routes to
email@example.com, it would automatically put a forward on
fluff0001@nexusto go to
fluffy@gmailand all Fluffy's mail will be in the one place ie gmail.
Forwarding to : firstname.lastname@example.org
2.1. When the address on the Nexus account is not one that IT Services manages
If ITSS or HelpCentre staff...
math1234the sending address of eg
Nexus processes will.....
math1234which looks like
Forwarding to : email@example.com
firstname.lastname@example.org go to
math1234@nexuswhich will then forward it to the real
math1234@nexuscannot have a forward of just
email@example.com Nexus would say ... 'yes I know that address it is on account math1234' and would try and deliver the mail to back to
math1234@nexusand a mail loop would be set up.
3. If the address associated with the account changes
If the address associated with the account changes, the effect will depend on where the addresses are routed. If they are both to Nexus, the only effect will be on Calendering with ical/davmail which uses the email address rather than the username to make associations for sharing. See for example http://www.oucs.ox.ac.uk/nexus/calendar/iCal/davmail.xml where it refers to someones primary email address.
If the address on the account changes to one that is not routed to Nexus, then a forward will be automatically added. Even if you remove the forward it will be added back the next time the Nexus process runs!!
4. When we don't have an Oxford address
.ox.ac.ukdomain to be able to set on the account.
username@nexus. This is not something we want to perpetuate and we will be looking at ways to remove these accounts by detaching mailboxes and setting the account status to 'User' rather than 'UserMailbox' or 'MailUser' , or for active users, or negotiating with the dept to get an address assigned.