Cause. After reaching one of these limits, users can't send new messages for up to 24 hours . Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Rule 1: You can send emails to a maximum of 500 recipients per day through the Gmail website. If you are a Google Apps for Work user, your daily limit is 10000 email recipients per day. If the limit is exceeded, Gmail account may get temporarily disabled with the error - "Gmail Lockdown in Section 4." vUefm.