如何在Python中发送包含一些非ASCII字符的电子邮件？

import smtplib
from email.mime.text import MIMEText
from email.header import Header

# 邮件内容
subject = '测试邮件'
content = '这是一封包含非ASCII字符的测试邮件'

# 发件人和收件人
sender = 'sender@example.com'
receiver = 'receiver@example.com'

# 创建MIMEText对象，设置邮件内容和编码
message = MIMEText(content, 'plain', 'utf-8')
message['Subject'] = Header(subject, 'utf-8')
message['From'] = sender
message['To'] = receiver

# 发送邮件
try:
    smtpObj = smtplib.SMTP('smtp.example.com')
    smtpObj.sendmail(sender, receiver, message.as_string())
    print("邮件发送成功")
except smtplib.SMTPException:
    print("邮件发送失败")