The Mail system in OpenCart lets you send emails to specific customer groups. Not all at the time.
You can use this feature to send newsletters, information on specials, or to communicate any type of store information to select groups of customers.
NOTE:)
1:) If You need All Customers Groups You can select All Customers Like following Screenshot.
2:) There is no need to Extra Customize for All Customers Groups .
3:) All customers Email send is One kind of All Customers Groups .
SCREENSHOT:)
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