After sending your campaign with YAMM, you receive an message from Google saying that your account has been blocked. Please read this article to know why.
In an effort to fight spam and prevent abuse, Google will temporarily disable your account if it suspects an unusual activity with your account.
Unusual activities include (but is not limited to):
Sending many emails with a new Gmail or G Suite account. Google carefully monitors usage on your account, specifically when it is a new one. Make sure to 'warm' up your account before sending a lot of emails. You can start sending a few emails first, and only to people you know to avoid your account to be blocked by Google. Consult this article to learn other tips to avoid spam.
Receiving, deleting, or downloading large amounts of mail via POP or IMAP (Apple Mail, Outlook etc.) in a short period of time. If you're getting the error message, 'Lockdown in Sector 4,' you should be able to access Gmail again after waiting 24 hours.
Sending a large number of undeliverable messages. In that case, you will receive many messages that bounce back to your inbox. This should give you an alert about a stale database, and you will have to check again your contact list. Learn more
Using file-sharing or file-storage software, or third party software that automatically logs in to your account.
Leaving multiple instances of Gmail open. If this happens, please log out all the instances and relog in Gmail / Google Sheets only once, and with a single Google account.
Browser-related issues: If you find your browser continually reloading while attempting to access your inbox, it's probably a browser issue, and it may be necessary to clear your browser's cache and cookies.
- If you use Chrome, you should additionally head to chrome://extensions and disable all extensions until the lockouts stop happening. Once the lockouts have stopped, extensions can be enabled one at a time (each day or so) as needed. If another lockout occurs, the most recently enabled extension is most likely the cause. Learn more about managing Chrome extensions.
More information on Google documentation: https://support.google.com/mail/answer/43692?hl=en
Note that we do not have any control on the access to your email address. If your Gmail or G Suite account has been blocked, please contact Google directly.