How to Mirror Your Yahoogroup @ GoogleGroups
1. Get or set up an e-mail forwarder.
2. Set the forwarder to forward to YOURGROUP@googlegroups.com
3. Subscribe the forwarder to YOURGROUP@googlegroups.com
4. Set it to "Web Only" on your Googlegroups subscription. (This is
important to avoid a mail loop. GGs may have a loop checker in place, but
better safe than sorry.)
5. Subscribe it to your Yahoogroup, as "Individual e-mail" (the
verification will go to your googlegroup, click on the link and choose
"subscribe to mailing list")
That should work. If you can't find a forwarder, try Yahoo.ie or
Yahoo.co.uk, both free offer both pop3 and forwarding.
http://mail.yahoo.ie or http://mail.yahoo.co.uk
This works for now, but there are no guarantees in the future.