Creating a Customer Emails List - Google Adwords

1. Sign in to AdWords.
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3. Click Shared library.
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5. Click Audiences.
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7. Click +Remarketing list and select “Customer emails” from the drop-down menu.
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9. Enter a name.
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11. Select “Upload customer email addresses.”
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13. Choose a file (The data file must use the .csv format and must be no more than 5GB. )
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15. Enter an email opt-out link. Provide a link to the page where people can manage their preferences for receiving email from you, including opting out of any email lists they may be subscribed to.
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17. Set a membership duration.
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19. Check the box “This data was collected and is being shared with Google in compliance with Google’s policies.”
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21. Click Upload and save list. You can view the progress of your uploading file under “Audiences,” which can take up to 3 hours to complete.
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23. Add your customer emails list to your campaign.
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• To show ads on Gmail, add your list to a “Display Network only” campaign that uses “Gmail Ads” from the “Ad gallery.” To do this, open the campaign, click the Display Network tab, click + Targeting, choose your campaign and ad group, click “Add targeting” and select “Interests and remarketing,” then click “Remarketing lists” and select a list.
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• To show ads on Google Search, add your list to a “Search Network only” or “Search Network with Display Select” campaign.
• To show ads on YouTube, add your list to an “Online video” campaign.

Source: https://support.google.com/adwords/answer/6276125?hl=en#requirements