https://support.google.com/a/answer/166852?hl=en
Gmail sending limits in G Suite
To keep our systems healthy and your accounts safe, G Suite limits the amount of mail one user can send. Limits restrict the number of messages sent per day and the number of recipients per message.
If your users exceed a G Suite email sending limit, they’ll see an error message, such as:
- You have reached a limit for sending email.
- You reached a Gmail sending limit.
- You exceeded the maximum recipients.
After reaching one of these limits, a user can’t send new messages for up to 24 hours. However, they can still access their G Suite account and receive incoming email. The user can also access their other Google services. After this suspension period, sending limits are automatically reset and the user can resume sending mail.
Sending limits
Sending limits can change without notice. Limits per day are applied over a rolling 24-hour period, not a set time of day.
Note: Sending limits are different if your organization uses the SMTP relay service to route outgoing mail through Google. See instead sending limits for the SMTP relay service.
| Limit type | Limit |
|---|---|
| Messages per day Daily sending limit* |
2,000 (500 for trial accounts) |
| Messages auto-forwarded Messages automatically forwarded from another account, not included in the daily sending limit |
10,000 |
| Auto-forward mail filters Account filters that automatically forward mail |
20 |
| Recipients per message Addresses in the To, Cc, and Bcc fields of a single email* |
2,000 (500 external) |
| Recipients per message sent via SMTP (by POP or IMAP users) or the Gmail API Addresses in the To, Cc, and Bcc fields of a single email. Includes email sent using smtp-relay.gmail.com or smtp.gmail.com* |
100 |
| Total recipients per day Individual addresses count in every mail sent; 5 emails sent to 10 addresses count as 50 recipients* |
10,000 |
| External recipients per day Email addresses outside your primary domain, including domain aliases and alternate domains |
3,000 |
| Unique recipients per day Individual addresses count once a day; 5 emails sent to 10 addresses count as 10 unique recipients* |
3,000 (2,000 external, 500 external for trial accounts) |
*Applies to internal and external recipients
What also counts towards a user’s limits
- Mail sent from a user’s alternate address, or alias
- Mail an assistant sends on your behalf (if you delegate mail to an assistant)
- Mail sent from Gmail’s vacation responder
Gmail sending limits for mobile devices
When you use the Gmail for mobile app in Google Sync mode, the same sending limits apply as when you use Gmail in a web browser (described in the table above).
When you use the Gmail for mobile app in IMAP mode, the IMAP sending limits (described in the table above) apply.