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Gmail:

I Am On Gmail And I Don't Like Getting Copies Of My Messages

To turn off duplicate emails, log into your account. Then look for the dropdown in the top right corner of the page, which will be either your name or email address. Click that and then click Account. From your Account page, click the Preferences sidebar tab. Look for the 'I always want copies of my own messages' checkbox and uncheck that. Then click the Update Preferences button.

The official Groups.io user documentation is in the Groups.io Help Center.