我今天刚刚设置我的服务器与我的一个新的静态IP地址作为一个邮件和Web服务器。 networking服务器工作正常，邮件服务器工作正常接收邮件，但我无法发送任何邮件，除了我自己的域名。 我已经在SMTP日志中查找，它充满了这样的条目：
Oct 3 21:36:02 osxserver postfix/smtp[17767]: connect to mx3.hotmail.com[65.55.92.136]: Operation timed out (port 25) Oct 3 21:36:13 osxserver postfix/smtp[17965]: connect to mx1.icloud.com.akadns.net[17.172.34.10]: Operation timed out (port 25) Oct 3 21:36:32 osxserver postfix/smtp[17767]: connect to mx1.hotmail.com[65.55.37.72]: Operation timed out (port 25) Oct 3 21:36:43 osxserver postfix/smtp[17965]: connect to mx3.icloud.com.akadns.net[17.172.34.64]: Operation timed out (port 25) Oct 3 21:37:02 osxserver postfix/smtp[17767]: connect to mx3.hotmail.com[65.55.92.168]: Operation timed out (port 25) Oct 3 21:37:13 osxserver postfix/smtp[17965]: connect to mx3.icloud.com.akadns.net[17.172.34.65]: Operation timed out (port 25) Oct 3 21:37:32 osxserver postfix/smtp[17767]: connect to mx1.hotmail.com[65.54.188.72]: Operation timed out (port 25) Oct 3 21:37:43 osxserver postfix/smtp[17965]: connect to mx4.icloud.com.akadns.net[17.172.34.66]: Operation timed out (port 25) Oct 3 21:38:02 osxserver postfix/smtp[17767]: connect to mx3.hotmail.com[65.55.92.184]: Operation timed out (port 25) Oct 3 21:38:13 osxserver postfix/smtp[17965]: connect to mx6.icloud.com.akadns.net[17.172.34.70]: Operation timed out (port 25) Oct 3 21:38:32 osxserver postfix/smtp[17767]: connect to mx4.hotmail.com[65.55.92.184]: Operation timed out (port 25) Oct 3 21:38:43 osxserver postfix/smtp[17965]: connect to mx2.icloud.com.akadns.net[17.172.34.12]: Operation timed out (port 25) Oct 3 21:39:02 osxserver postfix/smtp[17767]: connect to mx2.hotmail.com[65.54.188.126]: Operation timed out (port 25) Oct 3 21:39:13 osxserver postfix/smtp[17965]: connect to mx2.icloud.com.akadns.net[17.172.34.11]: Operation timed out (port 25) Oct 3 21:39:32 osxserver postfix/smtp[17767]: connect to mx4.hotmail.com[65.54.188.126]: Operation timed out (port 25) Oct 3 21:39:43 osxserver postfix/smtp[17965]: connect to mx1.icloud.com.akadns.net[17.172.34.9]: Operation timed out (port 25) Oct 3 21:40:02 osxserver postfix/smtp[17767]: connect to mx4.hotmail.com[65.55.92.168]: Operation timed out (port 25) Oct 3 21:40:13 osxserver postfix/smtp[17965]: connect to mx5.icloud.com.akadns.net[17.172.34.68]: Operation timed out (port 25) Oct 3 21:40:13 osxserver postfix/smtp[17965]: 449966C1EC: to=<[email protected]>, relay=none, delay=39809, status=deferred (connect to mx5.icloud.com.akadns.net[17.172.34.68]: Operation timed out) 有关如何解决这个问题，以便我可以发送邮件的任何build议？ 我的服务器运行的是OS X Server 10.4.11，我的ISP是AT＆T的商务舱。
无论您的ISP是商务舱，通常在所有帐户上默认阻止出站端口25，并且您需要明确地启用在某种ISP控制面板上通过端口25进行连接的能力，或拨打电话给您的客户经理。
要排除故障，请打开telnet并尝试通过端口25连接到gmail或hotmail的MXlogging中列出的某个服务器。 您很可能无法连接。 一旦你有你的ISP打开的端口， voilà！