如何使用预先存在的帐户从程序_without_发送电子邮件？

import smtplib
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart

# 设置SMTP服务器信息
smtp_server = 'smtp.exmail.qq.com'
smtp_port = 465
smtp_user = 'your_email@your_domain.com'
smtp_password = 'your_email_password'

# 创建邮件对象
msg = MIMEMultipart()
msg['From'] = 'your_email@your_domain.com'
msg['To'] = 'recipient@example.com'
msg['Subject'] = 'Test Email'

body = 'This is a test email sent from a Python program.'
msg.attach(MIMEText(body, 'plain'))

# 发送邮件
try:
    server = smtplib.SMTP_SSL(smtp_server, smtp_port)
    server.login(smtp_user, smtp_password)
    server.sendmail(msg['From'], msg['To'], msg.as_string())
    server.quit()
    print('Email sent successfully.')
except Exception as e:
    print('Error sending email:', e)