发送到中文邮件讨论组的邮件总是不成功
我在http://www.rt-thread.org/看到有邮件讨论组的新闻，于是我发送邮件到中文讨论组rt-thread-cnusers+subscribe@googlegroups.com。不过每次都是失败。下面是google自动回复的邮件。We're writing to let you know that the group you tried to contact (subscribe) may not exist, or you may not have permission to post messages to the group. A few more details on why you weren't able to post:
* You might have spelled or formatted the group name incorrectly.
* The owner of the group may have removed this group.
* You may need to join the group before receiving permission to post.
* This group may not be open to posting.
If you have questions related to this or any other Google Group, visit the Help Center at http://groups.google.com/support/?hl=en_US.
Thanks,
Google Groups 是这个中文邮件讨论组的邮件地址有误，还是这个组没有开放？ 为什么每次我提出的问题最后都是我自己解决呢？呵呵。经过反复试验，发现时因为我们学校的原因。换用gmail邮箱之后立刻加入成功了。 为什么每次我提出的问题最后都是我自己解决呢？
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