OT - Getting Sendmail to not rewrite the recipient (to) address

[David W. Wormuth]

I'm trying to help two friends by creating permanent email addresses for 
them at their own domains. I have a working sendmail 8.12.8/linux RH 
8/domain setup for the original domain (call it X.org, and I've got Y.org 
and Z.org that I want to share). Mail is received and forwarded for a at Y.org 
and b at Z.org, but the addresses are changed to a at X.org and b at X.org during 
the processing.

There must be a way to tell sendmail to preserve the Y.org and Z.org domain 
names in the addresses, but I can't find a way. I can use MASQUERADE to 
force the domains to something else, but this then interferes with X.org 
addresses as well.

Any ideas

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David W. Wormuth
6781 Morehouse Flats Road
Jamesville, NY 13078