好的-经过无奈和网上搜索后，我发现问题是一个已知的错误，适用于Python
3.x，enprers.py，enpre_base64函数，其内容应如下所示…
def enpre_base64(msg): """Enpre the message's payload in base64. Also, add an appropriate Content-Transfer-Encoding header. """ orig = msg.get_payload() encdata = _benpre(orig) # new line inserted to ensure all bytes characters are converted to ASCII encdata = str(encdata, "ASCII") msg.set_payload(encdata) msg['Content-Transfer-Encoding'] = 'base64'
该错误已作为问题＃4768提出，并于2010-05-10升级为严重状态。希望它将在下一版本（3.1.3？）中修复。
问候，艾伦
