I spent this week at the M3AAWG Conference in San Francisco and the topic of Universal Acceptance was a hot one - mostly centering around EAI Mail. I had some good talks with John Levine, co-founder of CAUCE. He offered up some blog posts he wrote on EAI issues for any of you that wish to get up to speed on the subject:
They might be useful to explain to people what some of the issues are: