Thanks Matthew! Creating a proxy account on GMail and have it forward to 
the Google group did in fact do the trick.

Cheers,
   - Andreas

On 5/16/2011 4:17, Matthew Fulmer wrote:
> On Sat, May 14, 2011 at 8:35 AM, Andreas Raab<andreas.raab at gmx.de>  wrote:
>> Hi -
>>
>> I'm trying to set up commit notifications for the OpenQwaq project on
>> Squeaksource and so far I've managed to add an email address to the project
>> and (after enabling commit notifications by email I've successfully received
>> the messages on my private email account. However, when I was trying to add
>> the sender email of said commit notifications
>> (squeak-dev-noreply at squeaksource.com) to the Google group in order to allow
>> it to post I'm getting an error saying "Google Groups will not add 1 user
>> with a restricted address" and googling that message makes me end up at
>> http://groups.google.com/group/Google-Groups-Basics/browse_thread/thread/ab088f0df820cb97
>> which recommends to "ask the prospective member to use an e-mail address
>> Google groups will accept".
>>
>> So is there a way of changing the sender address? I notice that
>> source.squeak.org sends messages from "commits at source.squeak.org" but
>> shouldn't commit messages generally come from "<projectname>@domain"?
>
> I've never been able to send email to a google group unless I use
> Google's smtp server. One way to do that would be to set up a gmail
> account, and set it to forward mail from squeaksource to the google
> group. Gmail naturally uses google's smtp server, or some other
> shortcut to google groups
>
>