Hallo,
schau mal hier nach. Allerdings nur wenn Symantec installiert ist.
http://service1.symantec.com/S…nDocument&src=bar_sch_nam
oder:
901160 Some e-mail messages that are sent by Outlook 2003 users are not delivered after you enable the Sender Filtering feature in Exchange Server 2003, and message senders may receive a non-delivery report message
http://support.microsoft.com/d…aspx?scid=kb;EN-US;901160