Problem with authuser

[Brian <fecoughndie at gmail dot com>]

Hello everyone.  I'm having a bit of trouble getting authuser to work 
just right.  Here is the background information:

Migrating from Groupwise 8 to Zimbra 6.0.5, 1200 accounts
Groupwise is running on Netware OES 6.5 SP 8
Groupwise Internet Agent is version 8.0.0
Groupwise MTA is version 8.0.1
Groupwise POA is version 8.0.1
Zimbra 6.0.5 is running on Ubuntu 8.04 LTS server edition
Imapsync is version 1.286, installed via Synaptic

Here is the command I'm using:

--syncinternaldates --subscribed --host1 Groupwise.Server --user1 
User at Groupwise --authuser1 Admin at Groupwise --password1  PWCHANGED 
--authmech1 PLAIN --sep1 / --nosyncacls --prefix1 "" --skipheader 
'^Content-Type' \
   --host2 Zimbra.Server --user2 User at Zimbra --authuser2 Admin at Zimbra 
--password2  PWCHANGED --authmech2 PLAIN --ssl2

My problem is, when I run the command above, everything looks like it's 
working fine.  However, when I log into the user account on Zimbra, the 
mail from the admin account from Groupwise is what was synced.  In other 
words, the mail transfer that took place was Admin at Groupwise to 
User at Zimbra dot   I need the transfer to be User at Groupwise to User at Zimbra dot   
Does anybody have any insight as to why this is happening, or what I 
need to do to fix this?  Thanks in advance.