Gmail officially claims that with a regular Gmail account you can send up to 500 emails/day and with a Google Workspace account you can send up to 2,000 emails/day (details are here). So, if you’re a Google Workspace user, you can send a 10,000 recipient campaign: MailKing and Gmail Auto Follow Up will evenly distribute the campaign at 2,000 emails/day for 5 consecutive days.

However, Google throttles the number of emails a particular account can send based on a variety of factors, including:

• How old the particular Gmail or Google Workspace account is (the older, the better)
• How many conversations exist in the account (may existing conversations are better)
• Whether the account has sent mass emails before (if it has, then you’re better off)
• The content of the mass emails (non-spammy content)
• The bounce rate of the overall account (the lower, the better)

We don’t have exact rules on how Google decides how many emails an account can send at a particular time, but here’s what we’ve observed:

• A brand new Gmail account (ending in @gmail.com or @googlemail.com) with no history has a very limited sending ability. Sometimes you are limited to 10 emails right when the account is created.
• A brand new Google Workspace account, where the organization itself is new to Google Workspace, also has a very limited sending ability. The accounts which had six billing cycles usually are not restricted.
• A brand new Google Workspace account, where the organization has a history with Google Workspace, can send near the 2,000 emails/day limit almost immediately.
• If a large number of emails are marked as phishing, spam, or abuse you might have a very limited sending ability. Please check this note on how to ensure that your emails are marked as spam.
• If Google detects that you are sending abuse, illegal, or phishing emails, they might terminate your account and all associated accounts