求教！关于 Python3 SMTP 发送邮件的编码问题

最近在跟着学习廖雪峰的 Python 教程，到发送邮件这一章出现了编码问题，搜索一直得不到解决，特来求助广大 V 友。

以下是代码部分：

from email.mime.text import MIMEText

msg = MIMEText('hello, send by Python...', 'plain', 'utf-8')

# 输入 Email 地址和口令:
from_addr = input('From: ')
password = input('Password: ')
# 输入收件人地址:
to_addr = input('To: ')
# 输入 SMTP 服务器地址:
smtp_server = input('SMTP server: ')

import smtplib
server = smtplib.SMTP(smtp_server, 25)
server.set_debuglevel(1)
server.login(from_addr, password)
server.sendmail(from_addr, [to_addr], msg.as_string())
server.quit()

报错：

SMTP server: smtp.qq.com
send: 'ehlo Sakuoz 丶.lan\r\n'
Traceback (most recent call last):
  File "F:\github\pythonTest\pytest.py", line 16, in <module>
    server.login(from_addr, password)
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python35\lib\smtplib.py", line 693, in login
    self.ehlo_or_helo_if_needed()
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python35\lib\smtplib.py", line 599, in ehlo_or_helo_if_needed
    if not (200 <= self.ehlo()[0] <= 299):
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python35\lib\smtplib.py", line 439, in ehlo
    self.putcmd(self.ehlo_msg, name or self.local_hostname)
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python35\lib\smtplib.py", line 366, in putcmd
    self.send(str)
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python35\lib\smtplib.py", line 351, in send
    s = s.encode(self.command_encoding)
UnicodeEncodeError: 'ascii' codec can't encode character '\u4e36' in position 11: ordinal not in range(128)

\u4e36 经过 unicode 转换为中文丶，我发送的邮件（ QQ to 163 ）昵称中也有个丶，所以怀疑可能与昵称有关，但是经过测试删掉昵称中的丶还是报同样的错误，萌新的我一直不知道错在什么地方。。。请问问题出在哪里，该怎么解决，谢谢大家！

开发环境:

windows 10 64bit
python 3.5.2
atom