Hi Jeff I am wrestling with the same problem. However I set the masquerading - it just wont do it. My theory is that the user "root" is a "trusted user" and is allowed to override outgoing email addresses. I think this is overriding the masquerading. I suspect that the masquerading will work for non-trusted users. Also - if I change roots "from addresss" to eliminate the "host" then both the from " and "envelope sender" are sent without the host. Let me know if you find a better solution. Richard. Jeff Potter wrote: > > >> 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 > ------------------------------------------------------------------------ > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos >