> The problem is however, that the providers' smarthosts complain > about the sender's hostname (because it contains my "unofficial" > domain name), and this results sometimes in rejection of my message > at the adressee's mail server. Have a look at "rewrite configuration" section in /etc/exim.conf (incase, you are running exim). You just have to add an entry to /etc/email-addresses. -- saisanthosh