It has been widely reported that the Chinese government has
started blocking internet sites it considers subversive, and has
started a widespread campaign to monitor and block emails
critical of the government and of China in general.
China already has the technology to shut down all Internet
communications into and out of the country in the event
the government thinks "individual thought" and Chinese
curiosity about the world is getting out of hand.
And you are using Yahoo mail. The executives at Yahoo recently
used their resources to help the Chinese government apprehend
"spies" and "subversives" who were using Yahoo mail. Be very
careful.
Good luck.