PowerAddon allows sending outgoing emails through your own mail server’s SMTP. However, when using Office 365, you may have to configure an SMTP relay on your mail server’s end for it work correctly.
Follow the below steps to set this up:
Log in to your Office 365 tenant, open the Exchange Admin center and click Mail flow, and click Connectors.
Click the “+” symbol to create a new connector.
Under Select your Mail Flow Scenario, set the “From” field as Partner Organization, and the “To” field as Office 365. Click “Next” to proceed.
Give your relay connector a Name and a Description as required. Click “Next”.
Under “How do you want to identify the partner organization?”, select the second option, Click “Next”.
Under “What sender IP addresses do you want to use to identify your partner?”, click the “+” symbol to add the PowerAddon IP address, Click “Next”.
Once all the IP addresses are added, click “Next” to proceed.
A summary for the relay connector will then be displayed; click “Save” to create it.