sendmail 邮件只能发国内

[VNessie]

我自己搭建的服务器，装了sendmail，但是测试的时候发现一个奇怪的现象，126的邮箱可以秒收，国外邮箱完全发不了。
查看了log文件如下：
Jul 12 10:23:36 test sendmail[4355]: t6C2NZ5A004355: to==?utf-8?B?eWVmYW4ud3VAb3V0bG9vay5jb20=?= <*****@outlook.com>, ctladdr=******@hcl.com (1002/1002), delay=00:00:01, xdelay=00:00:00, mailer=relay, pri=32662, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent=Sent (t6C2NaHx004356 Message accepted for delivery)
Jul 12 10:23:40 test sm-mta[4358]: t6C2NaHx004356: to=<*****@outlook.com>, delay=00:00:04, xdelay=00:00:04, mailer=esmtp, pri=122959, relay=mx4.hotmail.com. [65.55.37.104], dsn=4.0.0, stat=Deferred: Connection reset by mx4.hotmail.com.

帮忙看看什么原因，谢谢！

[冰谛-王者法则]

因为有高墙