The following content was taken from Google Support Article: Sending Limits
| Limit type | Description | Business/ Education editions |
|---|---|---|
| Messages per day | Daily sending limit* | 2000 |
| 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 | 40 |
| Recipients per message | Addresses in the To, Cc, and Bcc fields of a single email* | 2000 (500 external) |
| Recipients per message (sent via SMTP by POP or IMAP users) | Addresses in the To, Cc, and Bcc fields of a single email* | 100 |
| Total recipients per day | Individual addresses count in every mail sent; 5 emails sent to 10 addresses count as 50 recipients* | 10,000 1,500 for mail merge |
| External recipients per day | Email addresses outside your primary domain, including domain aliases and alternate domains | 3000 |
| Unique recipients per day | Individual addresses count once a day; 5 emails sent to 10 addresses count as 10 unique recipients* | 3000 (2000 external) |
| Recipients mailed with a Google Apps Script | Seen in the article Quotas for Google Services | 1500/day 2000/day (within domain) |