Office 365

Connection from: [x] Office 365  
Connection to:   [x] Partner organization

This connector enforces routing and security restritions for email messages sent 
from Office 365 to your partner organization or service provider.
Name: RealSender
What do you want to do after connector is saved?
[x] Turn it on

Specify when you want to use this connector.
[x] Only when I have a transport rule set up that redirects messages to this connector

How do you want to route email messages?
Specify one or more smart hosts to which Office 365 will deliver email messages. 
A smart host is an alternative server and can be identified by using a fully qualified domain name (FQDN) or an IP address.
[x] Route email through these smart host
    rsxxx.realsender.com   [+]

How should Office 365 connect to your partner organization's email server?
[x] Always use Transport Layer Security (TLS) to secure the connection (recommended)
    Connect only if the recipient's email server certificate matches this criteria
    [x] Issued by a trusted certificate authority (CA)

Specify an email address for an active mailbox that's on your partner domain. 
You can add multiple addresses if your partner organization has more than one domain.
yourname@yourdomain.com [+]
[Validate]

[Validate]
	Validation in progress...
	Validation successful
	>	Task											Status
	>	Check connectivity to 'rsxxx.realsender.com'	Succeeded
	>	Send test email									Succeeded

Mail flow scenario
From: Office 365
To: Partner organization

Name
RealSender
Status
Turn it on after saving

Use of connector
Use only when I have a transport rule set up that redirects messages to this connector.

Routing
Route email messages through these smart hosts: ‎rsxxx.realsender.com‎

Security restrictions
Always use Transport Layer Security ‎(TLS)‎ and connect only if the recipient’s 
email server certificate is issued by a trusted certificate authority ‎(CA)‎.