import smtplib
from email.mime.text import MIMEText

smtp_server = "smtp.gmail.com"
smtp_port = 587
sender = "liuming256kb@gmail.com"
app_pwd = "xkbt oorr zylb lnjt"

msg = MIMEText("测试邮件内容")
msg["Subject"] = "SMTP测试"
msg["From"] = sender
msg["To"] = "6293968@qq.com"

with smtplib.SMTP(smtp_server, smtp_port) as server:
    server.starttls()
    server.login(sender, app_pwd)
    server.send_message(msg)