邮箱所属域名不存在

import smtplib
from email.mime.text import MIMEText

def send_email(sender, receiver, subject, message):
    msg = MIMEText(message)
    msg['Subject'] = subject
    msg['From'] = sender
    msg['To'] = receiver

    try:
        smtp_server = smtplib.SMTP('smtp.example.com', 587)
        smtp_server.starttls()
        smtp_server.login(sender, 'your_password')
        smtp_server.sendmail(sender, [receiver], msg.as_string())
        smtp_server.quit()
        print("邮件发送成功")
    except smtplib.SMTPRecipientsRefused as e:
        print(f"收件人拒绝: {e}")
    except smtplib.SMTPHeloError:
        print("服务器不响应HELO命令")
    except smtplib.SMTPNotSupportedError:
        print("不支持的SMTP命令")
    except smtplib.SMTPException as e:
        print(f"SMTP错误: {e}")
    except Exception as e:
        print(f"其他错误: {e}")

# 示例调用
send_email('your_email@example.com', 'invalid_domain@nonexistent.com', '测试邮件', '这是一封测试邮件')