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.
How to fix the problem
Look at the reasons below to learn how to prevent seeing these messages in the future.
Note: If you use your Gmail account through your work, school, or other organization, learn about Gmail sending limits through work or school.
"You have reached a limit for sending mail"
"Messages you sent couldn't be delivered"
A contact is getting too much mail
Prevent your emails from being blocked by Gmail
If you send many emails at a time or to large groups, learn how to prevent mail to Gmail users from being blocked.