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Understand Gmail's daily sending limits and how they affect your campaigns. Learn the difference between free and Workspace limits, how to stay compliant, and how to check your daily usage.
Gmail enforces a limit on how many emails you can send within a rolling 24-hour period. This is a hard limit set by Google — not by the mail merge tool you use. If you exceed it, Gmail will block further sending until the window resets. Emails that fail after the limit is hit are not automatically retried.
The limits exist to protect Gmail's infrastructure and to prevent abuse — large-scale spam campaigns from Gmail accounts would degrade email deliverability for everyone on the platform.
The sending limit differs depending on your account type:
These totals include all emails sent from your account — not just campaigns. If you send 50 regular emails in a day and then run a mail merge, those 50 count against your limit. For the official limits, see Gmail's Sending Limits on Google Support.
MassyMail is aware of Gmail's sending limits and is designed to help you work within them. When you attempt to send a campaign that would exceed your daily limit, MassyMail will warn you before sending and suggest using the scheduled sending feature to spread your campaign across multiple days.
For campaigns that fit within your daily limit, MassyMail will send at standard speed with short pauses between sends to avoid triggering Gmail's rate limiting on rapid-fire sends (separate from the daily limit).

The most reliable way to send large campaigns without hitting Gmail's limits is to use MassyMail's scheduled sending feature. Here's how to plan it:
To create a scheduled campaign, set up your campaign in MassyMail as normal, then click Schedule instead of Send Campaign. Set your preferred emails per day and the hour of day to trigger each batch.
MassyMail shows your remaining daily quota in the Account modal. Click your account icon in the top right of the MassyMail sidebar, and the account panel will display a usage card with your current plan, your daily email allowance, and how much of it has been used today.
This gives you a clear picture of how much sending capacity you have left before planning a new campaign.

For a complete walkthrough of Gmail mail merge — including templates, scheduling, and tracking — see our Gmail Mail Merge: The Complete Guide. New to MassyMail? Install it free from the Google Workspace Marketplace.
Send personalized bulk email campaigns directly from Gmail using your Google Sheets data. Schedule campaigns, track opens and clicks, and manage templates without leaving Google Workspace.