If you have on-premises Line of Business (LOB) applications that need to send email and you no longer have an on-premises Messaging environment (Exchange or otherwise), you can use Exchange Online (EXO365) to send these messages. Below are the steps needed to accomplish this task:
Note: You must send SMTP Relay mail to pod51008.outlook.com:587 using an online activated user with an ExO Mailbox.
Note: You can send ALL MAIL to this endpoint and the SMTP Relay server WILL deliver mail to the proper location (i.e. EXO365 mail is delivered along with Internet Mail being routed out and delivered)
General SMTP Relay settings for Office 365
1. Create a user with an Exchange Online mailbox
2. Configure either the LOB or IIS SMTP Relay server. In this example I am using an IIS SMTP Relay server that other applications can use to send mail:
4. Click Outbound Securityand configure the following settings
5. Right-click the Default SMTP Virtual Server node and select Properties
1. Click the Delivery tab
2. Click Outbound Connections
3. Click Outbound Security
4. Click the Access tab
a. Then select Authentication tab, select Anonymous access, Then click OK
b. Then select Relay tab, then select Only the list below, Add the IP addresses of the client Line-of-Business machines which will be sending the email messages.
You should now be ready to go and your Line of Business applications can send email messages
Microsoft Office 365 for Enterprise
I want to do the same thing, but my SMTP relay server keeps saying the TLS server certificate is missing in Event Log: "No usable TLS server certificate for SMTP virtual server instance '1' could be found. TLS will be disabled for this virtual-server." Any ideas?