I am getting this as well. I think the problem is a lot of people don't realize you're referring to the error console n the tool menu, they thing you're talking about the popup dialogue.
nsYahooSMTP.js: rawMSG : Exception : TypeError. Error message: szRaw is null 973 nsSMTPConnectionManager.js: onDataAvailable : Exception : Error. Error message: msg upload failed 88
