Are you using more than one of your own email addresses on your group? If so, you should set the non-primary addresses to “no email.”

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I signed up three of my email addresses to a group that I just moved from Yahoogroups so that I could send from any of them. I was also getting duplicate messages, until I chose “no email” for the ones that are not my primary address.

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Hope this helps,

Best,

Terry Tegnazian