Some of my correspondents' e-mail displays "smart" quotes and "smart"
apostrophes like this, making an e-mail unreadable:

’

“

Is this because of a setting in my e-mail program (OE6), or in the sender's
e-mail program? I doubt the problem is my program, since I only have this
problem with a few people.

Is there a setting that can be changed in the sender's program (which could
be anything, not necessarily OE) that avoids this problem?