Hi,
machine accounts will not receive any mail, hmmm?
You can not delete machine accounts via admin-panel. Had the same prob yesterday.
Situation: Shut down NT for testing reasons. Brought up e-smith with domain-master/domain-logons. Could not join one w2k WS to the new/old domain. (Other WS worked so smooth, folks

)
I worked that on the client side:
1. Unmapped all network connections.
2. made WS member of "anyworkgroup".
3. reboot
4. joined Samba-Domain -> different error messages ("machine-account in use" and such).
5. So: Shut down that WS. Drink coffee and build a new webpage (1-2 hours).
6. Brought up that WS again. Joined Domain. No errors.
Samba (same as NT, if you rebuild a WS there) seems to need some time to "forget" the old/invalid machine account.
alex