邮箱发给某些收件人时总是被退回，但是可以收到他们的邮件，发给他们发不出去。其他收件人收发都正常，哪位可以告诉该怎么解决啊？
Please scroll down for English. nancy_jiang@greenroad.com.cn，您好: 您发送到 zahid.iqbal@ics-cargo.com 的邮件被收件人服务器拒收了，对方服务器返回的原因如下：SMTP error, RCPT TO: 554 5.7.1 Service unavailable; Client host [223.252.214.64] blocked using hostkarma.junkemailfilter.com=127.0.0.2; Black listed at hostkarma http://ipadmin.junkemailfilter.com/remove.php?ip=223.252.214.64. 您的原信请看附件。 Dear nancy_jiang@greenroad.com.cn, Your message to zahid.iqbal@ics-cargo.com was rejected by the recipient domain. The error that the other server returned was:" SMTP error, RCPT TO: 554 5.7.1 Service unavailable; Client host [223.252.214.64] blocked using hostkarma.junkemailfilter.com=127.0.0.2; Black listed at hostkarma http://ipadmin.junkemailfilter.com/remove.php?ip=223.252.214.64". Your original message is included as attachment.
Please scroll down for English. nancy_jiang@greenroad.com.cn，您好: 您发送到 zahid.iqbal@ics-cargo.com 的邮件被收件人服务器拒收了，对方服务器返回的原因如下：SMTP error, RCPT TO: 554 5.7.1 Service unavailable; Client host [223.252.214.64] blocked using hostkarma.junkemailfilter.com=127.0.0.2; Black listed at hostkarma http://ipadmin.junkemailfilter.com/remove.php?ip=223.252.214.64. 您的原信请看附件。 Dear nancy_jiang@greenroad.com.cn, Your message to zahid.iqbal@ics-cargo.com was rejected by the recipient domain. The error that the other server returned was:" SMTP error, RCPT TO: 554 5.7.1 Service unavailable; Client host [223.252.214.64] blocked using hostkarma.junkemailfilter.com=127.0.0.2; Black listed at hostkarma http://ipadmin.junkemailfilter.com/remove.php?ip=223.252.214.64". Your original message is included as attachment.
