邮件代理软件

例句：

1. 1. The company uses a mail proxy to protect its email communications.
   该公司使用邮件代理来保护其电子邮件通信。
2. 2. The proxy server is responsible for filtering out spam and malicious emails.
   代理服务器负责过滤掉垃圾邮件和恶意电子邮件。
3. 3. The proxy helps to maintain the privacy of the user's online activity.
   代理有助于维护用户的在线活动隐私。