How to setup SMTP Relay on Office 365 - Step by step with screenshots

How to setup SMTP Relay on Office 365 - Step by step with screenshots

1. Obtain the public IP address you’re using. A dynamic IP address isn’t supported or allowed. You can share the IP with other devices and users, but you shouldn’t be sharing the IP with anyone outside of your company. Make note of this IP address for later.

1. Log on to the Office 365 Portal.

2. Click Domains on the left pane.

3. Check one of your domains and click Manage DNS to record your DNS information such as MX and CNAME records.

4. Open Exchange admin center from Admin.

5. In the Exchange Admin Center, select Mail Flow > Connectors.

6. Click + to create new connector by giving the Sender name and Sender public IP addresses.

7. In the DNS for your domain, we suggest that you modify your SPF record to include the IP address. The finished string should look similar to this: v=spf1 ip4:10.1.2.3 include:spf.protection.outlook.com ~all where 10.1.2.3 is your public IP address. Skipping this step could cause email to be sent to recipients’ junk mail folders.

8. In the device’s settings, specify a Smart Host value equal to the MX record value you recorded.

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