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[NOTE:? This only applies to Gmail accounts.]

While logged onto :
Find your profile name in the top right and click the dropdown arrow.
Choose Account.
Choose Preferences.
Scroll down to My Posts/I always want copies of my own messages? and untick the box.
Click the blue Update Preferences button.

See also /g/GroupManagersForum/wiki/Gmail.

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