I have a user that has several emailaddresses set up through outlook. His HDD expired and I rebuilt his machine using the same Outlook.pst file and the same version of windows / office. However one of his emails (from a privately purchased domain name) is not able to send emails out. Recieving is ok . I have checked the smtp details with the private company and the ones that we have entered are correct. His PST file is quite large at 1.8gb but not causing a problem just yet. Any ideas??