>> Accessible to the internet is a Fedora Cora 1 machine running sendmail for >> a particular domain. So, it has a MX record for that domain. >> >> Inside our firewall I have a Red Hat 7.3 machine that runs sendmail locally >> that has access out of the firewall on port 25. >Does that now mean the RH 7.3 Sendmail host is protected by the firewall >settings, so that from outside your net connections on port 25 will go >direct to the Fedora host running Sendmail? Or does the RH 7.3 Sendmail >can directly talk to other MTAs outside your net? I suspect former, but >am not sure. The former is true. Realistically, the 7.3 host never gets incoming mail, just outgoing. And it speaks directly to the MTA on each host. >> The 7.3 box just Whenever the 7.3 box sends mail out as root, its return address >> is root@xxxxxxxxxxxxxxxxxxxxxx The 7.3 is not in the same domain as the Fedora >> machine. The mail leaves the 7.3 box and gets to the Fedora machine. At the >> point where it hits the Fedora machine the return address is rewritten as the domain >> of the Fedora machine. > Do not test mailing using user root! First, it is a bad habit to use > root for something else than administration. Do not use it for testing > purposes or things for which you easily and better can use a normal user > account. Second, root is an exposed user, see your sendmail.mc for that > entry and the Sendmail documentation for comments: > http://people.freenet.de/slgig/cfreadme_en/masquerading_relaying.html. > So as root's mail is not masqueraded coming from the RH 7.3 host. I > suspect that all other user address are masqueraded with the other > domain. I don't use root except for admin tasks. LogWatch comes from root however. Thats how I noticed the issue. > What I do not understand because lack of information is: why do the mail > from Sendmail on RH 7.3 does get to the Sendmail on FC1? I suspect > because either it is addressed to a user address on the FC1 machine or > because on RH 7.3 you defined the FC1 Sendmail to be the SMART_HOST > (either in sendmail.mc or in mailertable). So the question is then to > where the email is addressed, whether for a recpient on the FC1 host or > to outside. Mail gets to the FC1 via emailing the local using, not by SMART_HOST. So, it is address to a user on the FC1 host, not outside. > Suspecting the sendmail.mc being for the Fedora Sendmail host, you did > not set up any other things like genericstable? I suspect you leaved the > LOCAL_DOMAIN(`localhost.localdomain')dnl >untouched in sendmail.mc. It would explain some guesses. Yes this is true. The exposed_user and local_domain have not be touched on the FC1 machine. The sendmail.mc included was from the FC1 machine. > Your original reason for mailing, was that a problem or just wondering? > If you have a Sendmail setup difficulty I fear you have to be more > precise again about what you want and what's not working as expected. > Alexander The original reason what I thought this was a problem, but it makes sense now. All the masq'ing is from the root account. Thanks for the help. Dave
