1. From any page click the Waffles (technically called Google Apps)

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2. Click Contacts

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3. If you already have a list of names and or emails here keep going.  Otherwise you'll need to see how to add folks to your contacts here.

Select anyone you want to add to your list.

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4. Make sure you have all names/emails you want selected

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5. Click labels

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6. Click Create label

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7. Type the name you want

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8. Click Save

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9. Now get to your email

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10. Click Compose

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11. Click Add Bcc recipients ‪(⌘⇧B)‬

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12. Type the group label you just created

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13. If it pops up then select it

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14. That's it. You're done.

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Interactive tutorial