Sendmail and masq
dbenigni at lutron.com
Wed Apr 28 15:20:54 UTC 2004
>> 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.
>> The 7.3 box just Whenever the 7.3 box sends mail out as root,
>> its return address is root at localhost.localdomain. 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.
>This looks like normal behavior to me. anyID at localhost.localdomain is
>not a valid, routable email address. It is only valid within the
>onfines of any single machine's internal mail system. It would be
>normal and desirable for an internet aware MTA to change such an
>to one that is routable.
>eDiamond Networking & Security
>eric at ediamond.net
While localhost.localdomain is not valid, I do not wish sendmail to
change the address in any such way. Especially coming from an outside
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