我应该如何检查我的ISP是否阻止端口25？
cmd> telnet25
确定哪个主机(子域)正在侦听端口25:
nslookup -q=MX
例如:
cmd> nslookup -q=MX gmail.com gmail.com MX preference = 50, mail exchanger = gsmtp147.google.com gmail.com MX preference = 50, mail exchanger = gsmtp183.google.com gmail.com MX preference = 5, mail exchanger = gmail-smtp-in.l.google.com gmail.com MX preference = 10, mail exchanger = alt1.gmail-smtp-in.l.google.com gmail.com MX preference = 10, mail exchanger = alt2.gmail-smtp-in.l.google.com gsmtp147.google.com internet address = 209.85.147.27 gsmtp183.google.com internet address = 64.233.183.27 gmail-smtp-in.l.google.com internet address = 64.233.183.114 cmd> telnet gsmtp147.google.com 25 220 mx.google.com ESMTP l27si12759488waf.25
在Linux上,我猜你可以"挖掘".
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