It looks to me like there is a “My membership settings” pane in the left of the google groups web interface that allows you to specify the “email used for membership”. I conjecture that this would control the delivery of group e-mails. I also strongly suspect that this will only allow you to choose from the e-mail addresses associated with your gmail account (though, to be clear, these do *not* have to be gmail addresses). It’s not clear to me from your e-mail whether logging into your gmail account in order to use the web interface is something that you’re willing or able to do.
Does this help at all?
John
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