Gmail send limits

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)