The different reasons to get the error message "You have reached a limit for sending mail. Your message was not sent." from Google are:

  • You sent a large number of undeliverable messages (hard bounces).

  • You have linked a POP or IMAP client (e.g.: Microsoft Outlook or Apple Mail) to your Gmail/GSuite account. You may then only send a message to 100 people at a time.

  • You are sending many emails with another tool (keep in mind that the limit is 500 emails/day with a normal Gmail account and 2000 emails/day with GSuite account).

  • You are leaving multiple instances of your Gmail/GSuite open on different devices.

More information can be found here:

If you use GSuite please look over here:

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