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- iRedMail 版本号：     v0.9.5-1
- 使用哪个数据库存储用户帐号（OpenLDAP，MySQL，PostgreSQL）： v0.6.1 (MySQL)
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内域邮箱可以发送，外域的邮箱发送了如下退信，请教是什么问题呢？

This is the mail system at host mail.sky-chip.com.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<zjwwind@21cn.com>: host mta.21cn.com[183.61.185.83] said: 543 suspected spams.
    (in reply to end of DATA command)

还有一个外域邮箱发送没有退信，但是队列里一直显示如下，也是发不出去
A94691880358     2517 Mon Oct 10 14:32:34  zhujw@sky-chip.com
(host mailgate.yi-enter.com[222.73.227.238] said: 421 5.7.1 Mail from 221.6.109.5 rejected. RBL <cbl.abuseat.org> (in reply to MAIL FROM command))
                                         zhujiaw@scc.com.cn

2E3A7188038F     2544 Mon Oct 10 13:50:34  zhujw@sky-chip.com
(host mailgate.yi-enter.com[222.73.227.238] said: 421 5.7.1 Mail from 221.6.109.5 rejected. RBL <cbl.abuseat.org> (in reply to MAIL FROM command))
                                         zhujiaw@scc.com.cn

97047188037F     3790 Mon Oct 10 11:35:25  zhujw@sky-chip.com
(host mailgate.yi-enter.com[222.73.227.238] said: 421 5.7.1 Mail from 221.6.109.5 rejected. RBL <cbl.abuseat.org> (in reply to MAIL FROM command))
                                         zhujiaw@scc.com.cn

6F061188038E     2523 Mon Oct 10 11:41:16  zhujw@sky-chip.com
(host mailgate.yi-enter.com[222.73.227.238] said: 421 5.7.1 Mail from 221.6.109.5 rejected. RBL <cbl.abuseat.org> (in reply to MAIL FROM command))
                                         zhujiaw@scc.com.cn