Exchange Server
EAC
(Exchange Admin Center)
Mail Flow > Send Connectors
[+] New send connector
new send connector
*Name:
Internet Mail
Type:
[x] Internet (For example, to send internet mail)
[next]
edit smart host
Specify a fully qualified domain name (FQDN), IPv4 address, or IPv6 address:
rsxxx.realsender.com
[save]
new send connector
*Network settings:
[x] Route mail through smart hosts
(unchanged)
[next]
new send connector - authentication
Smart host authentication:
[x] Basic authentication
[x] Offer basic authentication only after starting TLS
*User name:
(the one we sent you)
*Password:
(the one we sent you)
[next]
new send connector - routing
*Address space:
TYPE: SMTP
DOMAIN: *
COST: 1
[next]
new send connector - which exchange server
[EXCHANGE]
[add ->] EXCHANGE
[ok]
[finish]
Office 365
Microsoft Office 365 Admin center
Left-menu > Admin
Microsoft 365 admin center > … Show all
Microsoft 365 admin center > Admin centers > Exchange
Exchange admin center > Mail flow > Connectors
Connectors > Add a connector
New connector
Connection from: [x] Office 365
Connection to: [x] Partner organization
[Next]
Connector name
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
[Next]
Use of connector
Specify when you want to use this connector.
[x] Only when I have a transport rule set up that redirects messages to this connector
[Next]
Routing
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 [+]
[Next]
Security restrictions
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)
[Next]
Validation email
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]
Validation successful
[Validate]
Validation in progress...
Validation successful
> Task Status
> Check connectivity to 'rsxxx.realsender.com' Succeeded
> Send test email Succeeded
[Next]
Review connector
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).
[Create connector]
Zimbra Collaboration
Zimbra Collaboration
(network edition / open source)
> Admin Console
Zimbra Administration
> Configure
> Global Settings
> MTA
Authentication
Enable authentication [ ]
TLS authenticaton only [ ]
Network
Web mail MTA Hostnames: localhost
Web mail MTA Port: 25
Relay MTA for external delivery: rsxxx.realsender.com : 25
Relay MTA for external delivery (fallback): rsxxx.realsender.com : 25
Please [inform our support team](/we-deliver-your-emails/contacts) that you're using Zimbra Collaboration,
so that we configure our servers to accept the connection
without any further setup on your side
(no need to make any change to the Zimbra's postfix smtp settings)