如果其他网络及其管理员意识到您的服务器是发送垃圾邮件的源头，那么很可能阻止您的服务器的IP地址访问他们的网络。
If other networks — and their admins — realize that your server is the source of spam, they're likely to block your server's IP address from access to or from their network.
管理员通常想阻止除了从邮件效劳器的一切出站端口25。
Often administrators would like to block all outbound port 25 except from the mail server.
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