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Yes, There's a limit of 10 recipients per notifiers and 2 for autoresponders. So, you'd need to create additional notifications (containing the same information) if you wish to send the message to more than 10 people.
Also, you can check the guide about the Multiple Recipients.
In addition, to add multiple recipients into one notification,
1) Open the current notification and click to "Reply-To and Recipient Settings".
2) On the upcoming window, you can add your emails on "Recipient E-mail" with adding comma+space " ," between them.
If you need extra information, please let us know.
Have a great day.