Exchange Online Outbound Connector - Credentials

Question

Hi folks,
I am trying to set up an outbound connector and rule to route emails that I send using my Hotmail.com address to the SMTP server of Hotmail  (smtp-mail.outlook.com).
I have the rule set up and working and have configured the connector to use the smart-host. According to the documentation I have seen the 'on premisis' exchange should allow me to specify a credential, however the exchange online setup does not prompt me
for this.
The reason is that I receive email from multiple upstream accounts using Office 365 connected accounts. But by default it sends email using my domain SMTP account tagging the email with 'On Behalf of'.  This creates a security issue as it exposes a
mail address I don't want to give out.   I would like to relay email back through the account it came from so the correct 'from' address is used.
If anyone knows how to either give the outbound connector the correct credentials or solve the relay problem it would be a help.
Regards
Andy

Answer 1

Sadly, it seems as though you can't repurpose a SPO OAuth token. Pretty sure you'll need to use New-PartnerApplication
http://technet.microsoft.com/en-us/library/jj215772(v=exchg.150).aspx and generate a ClientId for EXO.
Looks like this is changing (again). Check out
http://msdn.microsoft.com/en-us/library/dn605895(v=office.15).aspx
I've not quite worked out if this will do 2-legged OAuth, yet.
Hope this helps!
//Adam