Error: 无法发送邮件(550, b‘The “From“ header is missing or invalid. Please follow RFC5322, RFC2047, RFC822_smtplib.smtpdataerror: (550, b'the "from" header i

Error: 无法发送邮件(550, b’The “From” header is missing or invalid. Please follow RFC5322, RFC2047, RFC822 standard protocol. https://service.mail.qq.com/detail/124/995.')

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

# 第三方 SMTP 服务
mail_host = "smtp.qq.com"  # 设置服务器
mail_user = "1537@qq.com"  # 用户名
mail_pass = "vvvrwjdkqnaujcgf"  # 口令

sender = '1537@qq.com'
receivers = ['14273@qq.com']  # 接收邮件，可设置为你的QQ邮箱或者其他邮箱

message = MIMEText('Python 邮件发送测试...', 'plain', 'utf-8')
message['From'] = Header('ceshi','utf-8')
message['To'] = Header('ces1','utf-8')

subject = 'Python SMTP 邮件测试'
message['Subject'] = Header(subject, 'utf-8')

try:
    smtpObj = smtplib.SMTP()
    smtpObj.connect(mail_host, 25)  # 25 为 SMTP 端口号
    smtpObj.login(`在这里插入代码片`mail_user, mail_pass)
    smtpObj.sendmail(sender, receivers, message.as_string())
    print("邮件发送成功")
except smtplib.SMTPException as e:
    print(f"Error: 无法发邮件{e}")
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