Yes--group settings -> access tab--way at the bottom under "Message moderation" there's a box to check to moderate the messages of "new members".
From: Discussion of advanced .NET topics. [mailto:ADVANCED-DOTNET@DISC...] On Behalf Of Peter Ritchie
Sent: Tuesday, September 09, 2008 8:41 AM
To: ADVANCED-DOTNET@DISC... Subject: Re: [ADVANCED-DOTNET] Retiring the ListServ
>My recommendation would be to require that new members have their first
posts moderated. That should cut down on bots joining up, sending X number of spam messages, and then abandoning their accounts.