I have been trying to configure iDrac alerts for a while now. But I seem to be getting the same error over and over again, ‘RAC0225: Sending the test mail failed’.
It turns out that when iDrac sends an email the FROM account is the following, as entered in the fields in iDRAC Settings>Network>Common Settings :
<DNS iDRAC Name>@<Static DNS Domain Name>
So in my case it was firstname.lastname@example.org
This means that you have to create an actual email on the mail server you are using, in case your server doesn’t (and shouldn’t) allow sending with arbitary names and domains.
I hope this works for you too!