Question about Exchange Online Protection Inbound Connectors

I switched to Exchange Online Protection from Microsoft. I configured Inbound and Outbound connectors and email is flowing with no problems. I have a  question about how I set things up. I am wondering if its the most efficient?

I have three exchange sites: New York, London and Sydney. Each has a mailbox server and hub transport servers. They are in the same Exchange Org, MyDomain.com, but they have different external IP addresses. I created three Inbound Connectors, one for each site, with appropriate IP addresses in each connector. Each site has a different TLS certificate as well, so I think this is the best config, but I would like some expert advice to make sure.

mydomain.com is used by most mailboxes in all three sites.
mydomain1.com is used by some mailboxes in New York.
mydomain2.com is used by some mailboxes in London
mydomain3.com is used by some mailboxes in Sydney

examples:

Inbound Connector NewYork to Microsoft
type = on-premise
sender domains = mydomain.com, mydomain2.com
send ip address: New York's external IPs
Security: TLS
TLS certificate: webmail.newyork.mydomain.com

Inbound Connector London to Microsoft
type: on-premise
sender domains: mydomain.com, mydomain3.com
send ip address: London's external IPs
Security: TLS
TLS certificate: webmail.london.mydomain.com

Inbound Connector Sydney to Microsoft
type: on-premise
sender domains: mydomain.com, mydomain4.com
send ip address: Sydney's external IPs
Security: TLS
TLS certificate: webmail.sydney.mydomain.com


Thank You
cyberleo2000Asked:
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Vasil Michev (MVP)Connect With a Mentor Commented:
If you want to use conditional routing, follow this article:

http://technet.microsoft.com/en-us/library/jj950234(v=exchg.150).aspx

Seems though that it has problems with some of the attributes:

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_28297179.html
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cyberleo2000Author Commented:
I know all about conditional routing. I'm simply asking if this is the most efficient way to setup my Inbound Connectors.
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