Re: [CentOS] dumb sendmail question -- how to get outbound messages to use "example.com" instead of hostname?

 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