有了域名怎么发邮件

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

# 邮件服务器配置
smtp_server = 'smtp.example.com'
smtp_port = 587
smtp_username = 'your_username'
smtp_password = 'your_password'

# 邮件内容
msg = MIMEText('这是一封测试邮件', 'plain', 'utf-8')
msg['From'] = Header('发件人', 'utf-8')
msg['To'] = Header('收件人', 'utf-8')
msg['Subject'] = Header('测试邮件', 'utf-8')

# 发送邮件
try:
    server = smtplib.SMTP(smtp_server, smtp_port)
    server.starttls()
    server.login(smtp_username, smtp_password)
    server.sendmail(smtp_username, ['recipient@example.com'], msg.as_string())
    server.quit()
    print('邮件发送成功')
except Exception as e:
    print('邮件发送失败:', str(e))