>I don't understand, do you mean
>add another MX and A record at
>the company site domain server,
In yours. The root problem is actually a good thing - modern mail systems
require that the sending domain name actually resolve to something to prevent
spammers. Otherwise, the SMTP protocol allows you to put literally anything in
the MAIL FROM: part of the transaction. It's possible to turn this feature off
by changing the source (it's one of the things in the 'dontblamesendmail'
options) but it is a Very Bad Idea.
As long as the receiving system can resolve whatever the sending system says to
*something*, you're good. Thus, an entry in your DNS like this:
Hmc1 in a 192.168.0.1
In mx your.mx.server
will fix it. You don't have to actually be able to connect to it; the name just
has to resolve.
(In case you care, the error message you posted has only one cause. In the last
few years, almost all mail systems have required the sending system to be in
DNS to prevent spammers on the theory that it's generally harder to spam if you
have to take the step of registering in DNS before you start sending out mail.
The NXDOMAIN message is telling you that the receiving system cannot find the
sending system in DNS (non-existent domain) so it's bailing.)
In general, make a practice of putting everything that gets an IP address into
DNS, even if you're using DHCP. It's been 35+ years since DNS was invented;
it's time.
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