Two Mail Error Msgs: Message Can't Be Saved/Drafts & Invalid Text Encoding

Question

My Mail was working fine until just recently. Now when I am replying or composing emails, out of the blue, in the middle of typing my message, I will get this error message first: "This message can't be saved to the Drafts mailbox."
After closing that error box which had nothing to do with my typing, I will then get this second error message: "Invalid Text Encoding....converted to the "Japanese (Shift JIS)" text encoding...."
I then close that message and try to finish typing my message. I've checked to see that my text encoding is set where it belongs, and it is never set to Japanese. Does anybody know what is going on here? Any help will be much appreciated. Thank you, Diane

Answer 1

The following test might be helpful in deciding what to try next: Create a New User Account, and as that New User try to set up one account -- since you have a POP set to leave messages on the server after download. If not familiar with setting up a New User Account, see:
http://docs.info.apple.com/article.html?path=Mac/10.5/en/8235.html
This will be a useful test to now check this behavior in another User Account, and of course is not meant to suggest a permanent switch to the New User Account, but rather a test of the Mail application outside of your normal User Account and its existing setup data.
Ernie