Beginner's question

[Alain G. Fabry]

Reading DNS and BIND 3rd Edition, I have a question concerning MX exchanger.
I have 2 systems running sendmail, say MX1.yyy.org and MX2.yyy.org
All my users' mail is received at MX1.yyy.org (yyy.org) using sendmail.
MX2.yyy.org does not have any users on the system but is running sendmail.
Is it possible to configure the DNS to have MX2 forward mail to MX1 without
adding MX1 as a mail exchanger in the DNS.

Example, can I

yyy.org.    MX mx2.yyy.org.
yyy.org.    a 1.2.3.4

If yyy.org is running sendmail, should it receive the mail forwarded from
mx2.yyy.org?

I've tried a similar setup but the mail gets returned to the sender with
****MX list for yyy.org points back to mx2.yyy.org
****.......Local configuration error

If I add Cw yyy.org in the sendmail.cf file on mx2.yyy.com, will mx2 forward
the mail to mx1 (yyy.com)?

I guess it would be a similar setup for some ISP to forward mail to a domain
from one of his clients, right?

I hope this makes sense and thanks for any help.

FYI, right now I have:
yyy.org.    MX mx1.yyy.org
yyy.org    A 1.2.3.4
And this works since mx1.yyy.org is yyy.org

 _Alain

______________________
Alain G. Fabry
Sr. LAN Administrator
The University of Texas - Pan American
External Affairs - CoSERVE
Phone : (956) 381-3361