Mastering Gmail Limits for Effective Email Campaigns

Earlier today, Lifehacker shared a guide on how to use Gmail combined with Google Docs to send personalized email campaigns. This raised an important question: how large can such a mailing list be? Specifically, how many recipients can you add in the TO, CC, or BCC fields before Google flags your account as spam?

By following a few key guidelines, you can avoid common pitfalls and keep your account safe from restrictions.

1. If you access Gmail through POP or IMAP protocols using email clients like Outlook or Apple Mail, you may send emails to up to 100 recipients at once. Exceeding this limit will result in your account being suspended for 24 hours with the notification "550 5.4.5 Daily sending quota exceeded."

2. When using Gmail’s web interface, the maximum number of recipients you can include in TO, CC, or BCC fields is 500. Violating this rule can lead to an account lockout lasting from 24 to 72 hours, accompanied by the error message "Gmail Lockdown in Section 4."

3. Sending emails with numerous invalid addresses that bounce back can also cause account suspension. Ideally, keep the number of undeliverable addresses below 25 to avoid issues.

4. Additionally, if you don’t access your Gmail account for more than 9 months, it risks being deactivated. While not directly related to mailing limits, this is an important consideration for account maintenance.

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