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用group. sendMessage超过两个字节的消息就发不出去了，比如aa发的出去，aaa就发不出去，没有报错，用user.sendMessage就没问题都能发出去
可能是被风控了，24小时之后再试试
@sssmzy 在 发送群消息有问题 中说：
碰到一样的问题
