Test whether a TCP port on a host is open and reachable.
Common ports: 22 SSH, 25 SMTP, 80 HTTP, 443 HTTPS, 3306 MySQL, 8080 HTTP-ALT.
有新优惠时发送一封简短邮件。精选主机优惠与降价信息 — 已验证，无垃圾邮件。
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