About the Narn I simply don't know.
As for Minbari mages, I believe that there are none. Unlike their relationship with Soul Hunters, their relationship with technomages is probably not hostile. But it may be *very* suspecting.
Occasional spoilers for mage trilogy:
<table bgcolor=black><tr><td bgcolor=black><font size=1 color=white>Spoiler:</font></td></tr><tr><td><font size=2 color=black>The Minbari have fought the Shadows and can recognize most Shadow technology. They have a fuzzy understanding of what the Shadows wanted and how they worked. During a war, you learn to know your enemy -- and their weapons.
They may have fought against technomages in the last war. Or possibly, Valen may have used the assistance of some technomages who didn't appreciate the Shadow gift. Valen used the help of several aliens and at that time, technomages still knew who had given the tech.
Or some Minbari may have joined the mages and been curious. Given their own pretty advanced technology, they may have figured out the origins of mage technology. After realizing it came from the Shadows, very few would approach it for anything short of destruction. Those who joined probably regretted it, informing others so they would not make the same mistake.
Most Minbari would consider accepting something from Shadows a mistake. If they took a close look at the tech, they might have even realized that one person needed to die for another to become a technomage.</font></td></tr></table>
[This message has been edited by Lennier (edited January 24, 2002).]