Hello All, I have just been informed by one of our engineers that he is unable to email two sites in particular. We have Exchange Server 5.5. The following is the error: whomever @****on.de on 9/24/2002 3:41 PM The recipient was unavailable to take delivery of the message The MTS-ID of the original message is: c=US;a= ;p=ASE;l=BROOKLYN-020911145620Z-3519 MSEXCH:IMS:ASE:Billerica:BROOKLYN 3499 (000B09AA) Host unreachable Both sites that we are trying to reach are German sites: either @photon.de or @bathon.de. These emails sit in the Internet Mail queue stating 'host unreachable' for 48 hours then kick back the above NDR. I don't think it is on our end, but not sure. Any thoughts? Marie L. Spaulding mspaulding@xxxxxxxxx