親測，163郵箱不能傳送，我用的qq的

import smtplib
from email.mime.text import MIMEText

sender = '[email protected]'
passwd = '****'
receiver = ["[email protected]","[email protected]"] # 多個收件人放在一個list裡面

content = 'hello world'
subject = 'this is a test'

msg = MIMEText(content, 'plain', 'utf-8'
 
)  # 中文需引數‘utf-8’，單位元組字元不需要

msg['Subject'] = subject
msg['From'] = sender
msg['To'] = ','.join(receiver) # 這裡必須要把多個郵箱按照逗號拼接為字串

server = smtplib.SMTP_SSL("smtp.qq.com", 465) # 親測qq郵箱才有用，163沒用
server.login(sender,passwd)

try:
    server.sendmail(sender, receiver, msg.as_string())
    print('email sent'
 
)
except smtplib.SMTPException as e:
    print(e)