IT Assistant failure to send SMTP E-mail

After several hardware failures on old Poweredge T610 (pretty much the only Dell server in our environment), I thought I'd try to be proactive and set up the OpenManage software so we could get E-mail notifications for critical alerts.  I found that it wasn't as straight-forward as I had hoped:  After downloading/installing/configuring the OpenManage Server Administrator, I learned that, unless I felt like coding my own scripts to send E-mail notifications when an alert tripped, that I also had to download/install/configure the OpenManage IT Assistant component as well (these downloads are quite large!!).

Now that IT Assistant is running and seems to be monitoring itself (the only Dell server), I have found that I'm unable to get it to send an SMTP E-mail notification.  I have other systems running on the same server that send out SMTP messages just fine, but I can't even get a test message (using the "Services Tier Configuration" tab in the Troubleshooting Tool) to go through.  It gives a less-then-helpful error message: "Unable to send e-mail by way of the configured SMTP server".

The SMTP server being used is configured for port 2525 (default is usually 25), and I've added that to the FQN (i.e. my.smtp.server:2525), but that made no difference.  Is there some sort of built-in limitation as to which port may be used (assuming that is what the problem is)?  I'm in the process of downloading OpenManage Essentials right now....could this possibly be addressed with that "release"?