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Contents
1. Limits for sending & getting mail
To help prevent spam and keep accounts safe, Gmail limits the number of emails you can send or get per day, and the number of people you can add as recipients.
https://support.google.com/mail/answer/22839?hl=en
"You have reached a limit for sending mail" You may see this message if you send an email to a total of more than 500 recipients in a single email and or more than 500 emails sent in a day.
When you get this error, you should be able to send emails again within 1 to 24 hours.
To prevent this from happening in the future, try creating a Google Group of all your email recipients and sending the message to that group's email address.