求助:关于邮件接受延迟的问题

lucksir9743

最近,我们公司发现,不少发自国外的邮件出现了延迟现象,延迟的时间在3小时-2天都有,有谁能帮忙分析一下的
这是我们联系对方,对方提供的一些信息:
前缀已经被我用X隐去.

From: Mail Delivery System
> Sent: Saturday, November 24, 2007 6:38 PM
> To:
> Subject: Delayed Mail (still being retried)
>
> >
> ####################################################################
> # THIS IS A WARNING ONLY. YOU DO NOT NEED TO RESEND YOUR MESSAGE. #
> ####################################################################
>
> Your message could not be delivered for 1.0 hours.
> It will be retried until it is 5.0 days old.
>
> For further assistance, please send mail to <postmaster>
>
> <xxx@ethero.com>: host outbounds200.obsmtp.com[207.126.147.11] said:
> 451
> Cannot connect to domain:ethero.com - psmtp (in reply to RCPT TO
> command)
>
> <xxx@ethero.com>: host outbounds200.obsmtp.com[207.126.147.11] said:
> 451 Cannot connect to domain:ethero.com - psmtp (in reply to RCPT TO
> command)
>
> <xxx@ethero.com>: host outbounds200.obsmtp.com[207.126.147.11] said:
> 451
> Failed in remote data xmission - psmtp (in reply to end of DATA command)
>
> <xxx@ethero.com>: host outbounds200.obsmtp.com[207.126.147.11] said:
> 451
> Failed in remote data xmission - psmtp (in reply to end of DATA command)
>
> <xxx@ethero.com>: host outbounds200.obsmtp.com[207.126.147.11] said:
> 451
> Failed in remote data xmission - psmtp (in reply to end of DATA command)
>
> <xxx@ethero.com>: host outbounds200.obsmtp.com[207.126.147.11] said:
> 451
> Failed in remote data xmission - psmtp (in reply to end of DATA command)
>
> <xxx@ethero.com>: host outbounds200.obsmtp.com[207.126.147.11]
> said:
> 451 Failed in remote data xmission - psmtp (in reply to end of DATA
> command)
>
> <xxx@ethero.com>: host outbounds200.obsmtp.com[207.126.147.11] said: 451
> Failed in remote data xmission - psmtp (in reply to end of DATA command)
>
> <xxx@ethero.com>: host outbounds200.obsmtp.com[207.126.147.11] said: 451
> Failed in remote data xmission - psmtp (in reply to end of DATA command)