We recommend using only the official WhatsApp build from Mac App Store: https://apps.apple.com/app/id1147396723. With other builds bulk messaging has not been tested by our team.

Before starting messaging to your real recipients, we strongly recommend that you first make a test messaging to your colleagues/buddies/family. That helps you to understand how the application works, how sending process will look like, and if it will work properly on your device. And only then start messaging with real recipients.
If you installed multiple copies of WhatsApp (for example, from the App Store, and from their website). Please delete other copies and keep only one. Because the application will incorrectly determine which of the WhatsApp copies will need to interact with.
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