If you check your SMTP settings and they seem to be ok. Try to investigate your DNS settings. One method of doing this is to do an nslookup. Then invoke a mail exchanger query. From any win2k workstation or server on the network, go to command prompt and type nslookup. Enter and type set q=mx Enter then type any internet domain name e.g. yahoo.com, hotmail.com etc Press enter and see if it replies the query with the Mx record of the domain. If it doesn't and keeps timing out then u need to check your DNS settings. By the way, what is the event id for the NDR report? ----------------------------------------------------------------------- Opeyemi Olomo Corporate Development, Ocean and Oil Holdings 10th Floor, The Octagon 13A AJ Marinho Drive, Victoria Island Lagos Office Tel No: +234 1 320 0818-9 Ext: 123 Mobile No: +234 802 291 0164 -----------------------------------------------------------------------