If Gmail is returning your email messages with a message stating that you have sent too many emails, then this is the cause.
You are only permitted to send or receive a specific number of emails daily using Gmail.
It’s crucial to understand that Gmail sending restrictions apply per user and are thus shared by all email clients, Google add-ons, SMTP clients, and other applications that might be using your Gmail account to send emails.
You’ll see an error notice that says something like “you’ve surpassed a Gmail limit for sending email” or “Oops.. the system encountered a problem” if you go over the sending limit, and Gmail may occasionally temporarily stop you from sending new messages.
For more information or any further support contact to the Gmail support team or contact us
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