发送邮件域名是什么

import smtplib
from email.mime.text import MIMEText

# 邮件配置
smtp_server = 'smtp.example.com'
smtp_port = 587
username = 'user@example.com'
password = 'password'
from_addr = 'user@example.com'
to_addr = 'recipient@example.com'
subject = 'Test Email'
content = 'This is a test email.'

# 创建邮件对象
msg = MIMEText(content)
msg['Subject'] = subject
msg['From'] = from_addr
msg['To'] = to_addr

# 发送邮件
try:
    server = smtplib.SMTP(smtp_server, smtp_port)
    server.starttls()
    server.login(username, password)
    server.sendmail(from_addr, [to_addr], msg.as_string())
    server.quit()
    print('Email sent successfully!')
except Exception as e:
    print(f'Failed to send email: {e}')