To unsubscribe, please go to the Google groups website, click on 'edit
my membership' and make the appropriate changes. You may need to be
signed in under the email account with which you subscribed to do
this.
There is an additional option to read the postings on the group site
rather than receive email. That would reduce the amount of email
received and allow you control over when and how you read the
messages.
Thanks to everyone for their cooperation!