> Since you are using NAT, the important IP address and host name > associated with it is the one the outside world sees. Does that IP > address > have a host name the world sees and does that name then resolve to > the same IP > address? Yup -- that's what I'm trying to get sendmail to use, but it's insisting on using the internal hostname, inclusive of the machine name. I.e., "betsy.example.com" is the actual hostname, at 10.x.x.x; all the 10.x.x.x machines have custom /etc/hosts that define betsy.example.com, etc., with their 10.x.x.x IPs. When it sends email to the outside world, I need to to send as "example.com", dropping the "betsy" part. Is this really that hard? best, Jeff -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20070702/909e5276/attachment-0005.html>