I don't mount - it's as simple as that. If I want to frame a print, I go to the local frame shop and explain what I want. They then mount and frame it for me.
Prints to be shipped are not mounted for reasons of both postage and security. A mounted print is actually more likely to be damaged by rough handling than one shipped between two pieces of cardboard. It takes a lot less bending to damage cardboard than photo paper! The needed force may be greater, but in my experience the postal services of the world have sufficient force to bend anything. so I include cardboard to take the damage, and leave the print unmounted.