On Jul 2, 2007, at 12:43 PM, Jeff Potter wrote: > The problem is the hostnames of these machines don't exist in real > DNS anywhere, so when they try to send mail to the outside world, > other mail servers are seeing an invalid domain in the from address > and summarily rejecting the messages (which makes sense). > > I need to figure out how to tell sendmail, when sending outbound > messages, to use the domain name "example.com", instead of > "subdomain.example.com". It would seem simple in /etc/mail/ > sendmail.mc: You can set the host name other people see with something like define(`confDOMAIN_NAME', `your.server_name.com') -- Chris