Try this if you haven't already. Network settings Set DNS DRAC Name to: fromuser Set DNS Domain Name to: fromdomain.com  Alerts SMTP setttings SMTP server: smtp.office365.com enable authentication use user account to send from in office 365 Port: 587 [URL] 
Hello, I am trying to setup email alerts on a PowerEdge R430 with iDRAC8. We use Office 365 for our email. I tried many different combinations of settings but I always end up with the error "RAC0225: Sending the test mail failed." when I try to send a test email. I used the SMTP settings provided in this page: support.office.com/.../POP-and-IMAP-settings-for-Outlook-Office-365-for-business-7fc677eb-2491-4cbc-8153-8e7113525f6c DNS and other network settings and all set correctly in iDRAC. I also tried setting the DNS Domain Name field with Office 365 domain name as recommended is some Reddit page but the problem still persists. I also tried using the SMTP server IP address instead of the domain name and tried using port 25 as well. Your help is much appreciated.
iDRAC8 Email Alerts Not Working