Interesting. There's a non-Asian alternative for some accounts: While setting up POP Peeper
for checking a free Yahoo account, I noticed optional IMAP settings. The settings worked for me in Thunderbird too -- although they say IMAP may not work for all accounts.
Incoming: imap.mail.yahoo.com, port 993, SSL
Outgoing: smtp.mail.yahoo.com, port 465, SSL
I had to change the "Sent" folder in Copies & Folders.