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Your Amazon Simple Email Service (Amazon SES) account has a set of sending limits to regulate the number of email messages that you can send and the rate at which you can send them. Sending limits benefit all Amazon SES customers because they help to maintain the trusted relationship between Amazon SES and Internet service providers (ISPs). Sending limits help you to gradually ramp up your sending activity and decrease the likelihood that ISPs will block your emails because of sudden, unexpected spikes in your email sending volume or rate.
The following are Amazon SES sending limits:
Sending Quota—The maximum number of emails that you can send in a 24-hour period. The sending quota reflects a rolling time period. Every time you try to send an email, Amazon SES checks how many emails you sent in the previous 24 hours. As long as the total number of emails that you have sent is less than your quota, your send request will be accepted and your email will be sent. If you have already sent your full quota, your send request will be rejected with a throttling exception. For example, if your sending quota is 50,000, and you sent 15,000 emails in the previous 24 hours, then you can send another 35,000 emails right away. If you have already sent 50,000 emails in the previous 24 hours, you will not be able to send more emails until some of the previous sending rolls out of its 24-hour window.
Maximum Send Rate—The maximum number of emails that you can send per second. You can exceed this limit for short bursts, but not for a sustained period of time.
When you are in the sandbox, your sending quota is 200 messages per 24-hour period and your maximum sending rate is one message per second. To increase your sending limits, you need to request production access. For more information, see Requesting Production Access to Amazon SES. After you request production access and start sending emails, you can increase your sending limits further by following the guidance in the Increasing Your Amazon SES Sending Limits section.
Sending limits are based on recipients rather than on messages. For example, an email that has 10 recipients
counts as 10 against your quota. However, we do not recommend that you send an email to multiple recipients in one call
SendEmail because if the call to send to one of the recipients fails, the entire email will be rejected and none of the recipients
will get the intended email. We recommend that you call
SendEmail once for every recipient.
To increase your sending limits, see Increasing Your Amazon SES Sending Limits.
For information about the errors your application receives when you reach your sending limits, see What Happens When You Reach Your Amazon SES Sending Limits.
To monitor your sending limits by using the Amazon SES console or the Amazon SES API, see Monitoring Your Amazon SES Sending Limits.
For definitions of Amazon SES terms, see the AWS Glossary.