如何在python电子邮件列表中换行

from email.header import Header

subject = Header("邮件主题", 'utf-8').encode()

message['Subject'] = subject

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

# 创建邮件对象
message = MIMEText('邮件内容', 'plain', 'utf-8')

# 设置发件人、收件人、主题
message['From'] = Header("发件人", 'utf-8')
message['To'] = Header("收件人", 'utf-8')
subject = Header("邮件主题", 'utf-8').encode()
message['Subject'] = subject

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