Variable Mail

Creating a bot on that, at the end, there is a mail sent to a specific address i've created a variable and assigned the mail name@site.extension
on the mail block i've set that variable but, for some reason (that i do not know and understand) the mail's not sent.

Here log

{
"error": "Error: Message failed: 454 Throttling failure: Daily message quota exceeded.",
"transportConfig": {
"host": "email-smtp.eu-west-3.amazonaws.com",
"port": 587,
"auth": {
"user": "AKIA**",
"pass": "**"
}
},
"email": {
"from": ""Typebot Notifications" <notifications@get-typebot.com>",
"to": [
"@gmail.com" ], "replyTo": "@gmail.com",
"subject": "**", "text": " \ntelefono: \n\nHa chiesto :\n* \nper il settore : \n*\n\nPuò essere ricontattato via mail : Si\n\nVuole ricevere comunicazioni diverse : Si"
}
}

Some one can help me to better understand?
Thank you