Being required to use Mailgun to track messages being sent through Salesforce. I have looked into and tried to integrate with SalesForceSMTP, but everytime I turn the relay on (active), no emails are delivered (test or "real"). Has anyone successfully done so? Can you share what you did? Thank you!

Being required to use Mailgun to track messages being sent through Salesforce. I have looked into and tried to integrate with SalesForceSMTP, but everytime I turn the relay on (active), no emails are delivered (test or "real"). Has anyone successfully done so? Can you share what you did? Thank you!