> Why  bad design ?... It works very fine with many customers on mine.

Because,  as  I  explained,  publishing hostnames in public DNS MX RRs
even  though  you  know  them  to be unreachable is a bad practice. It
creates  troubleshooting  confusion  and  wasted  traffic  with no net
benefit.

In  your  scenario,  you are routing to users @office.domain.com _not_
using  the  DNS  MX  record for office.domain.com (there is none), but
using  its  A  record. You might just as well put office.domain.com in
your  IMail server's HOSTS file and leave it at that (though using DNS
for just that A record is reasonable in its own right).

--Sandy



------------------------------------
Sanford Whiteman, Chief Technologist
Broadleaf Systems, a division of
Cypress Integrated Systems, Inc.
e-mail: [EMAIL PROTECTED]

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