Dear all, After I send mail to some sender, my user always got some NDR to say the mail cannot be deliveried. some of error messages as following: 1. Your message To: snowflysnow@xxxxxxxxx Subject: Re: Sent: Mon, 23 Sep 2002 14:56:33 +0800 did not reach the following recipient(s): snowflysnow@xxxxxxxxx on Mon, 23 Sep 2002 15:11:53 +0800 ²»ÈÏʶ´ËÊÕ¼þÈ˵ÄÃû³Æ ÔʼÓʼþµÄ MTS-ID Ϊ: c=CN;a= ;p=Bertelsmann;l=MAIL0209230708SR53N69Y MSEXCH:IMS:Bertelsmann:BBC:MAIL 3550 (000B099C) 550 << webmaster@xxxxxxxxxx> : Sender address rejected: reject 2. Your message To: st-kasandra@xxxxxxxx Subject: Re: Ð޸ĸöÈËÐÅÏ¢ Sent: Tue, 24 Sep 2002 11:28:32 +0800 did not reach the following recipient(s): st-kasandra@xxxxxxxx on Tue, 24 Sep 2002 11:45:32 +0800 ²»ÈÏʶ´ËÊÕ¼þÈ˵ÄÃû³Æ ÔʼÓʼþµÄ MTS-ID Ϊ: c=CN;a= ;p=Bertelsmann;l=MAIL0209240340SR533XHM MSEXCH:IMS:Bertelsmann:BBC:MAIL 3554 (000B099C) 554 << mbs@xxxxxxxxxx> : Sender address rejected: Access denied Is this means the destination mail server have set the filter to block specific mail address send mail to it? Thanks!