OAL Generator error 9325

[Bob Weiner]

I have ~105 names that are not being replicated to the GAL. For each, I am
getting the following error on my mail server:

==============================================
Error
Source: MSExchangeSA
Category: OAL Generator
Event: 9325

OALGen will skip user entry 'Last, First' in address list '\Global Address
List' because the SMTP address '' is invalid.

- Default Offline Address List
===============================================

I do not see any problems in looking at the mail and proxyAddresses
attributes on any of these accounts. Is there something else I can check?
What else could cause this error?

I'm running Exchange 2003 in a Windows 2003 domain (2000 Native mode).
Neither google nor ms seem to know anything about this.

thanks in advance,
bob