Amazon Simple Email Service
Developer Guide

Limits in Amazon SES

This topic lists limits within Amazon Simple Email Service (Amazon SES).

Limits Related to Email Sending

The following tables list limits related to email sending.

Sending Limits


Sending limits are based on recipients rather than on messages.

Limit Description
Sending limits in the sandbox environment
  • Sending quota: 200 emails per 24-hour period.

  • Maximum send rate: 1 email per second.


    The rate at which Amazon SES accepts your messages might be less than the maximum send rate.

To increase your sending limits, open an SES Sending Limit case in Support Center. For more information, see Moving Out of the Amazon SES Sandbox.

Sending limits outside of the sandbox environment

Your sending quota and maximum send rate vary depending on your unique use case and your sending practices.

If your account is in good standing (that is, it's not under review and its ability to send email isn't paused), and you're approaching your current sending limits, we automatically increase the sending limits for your account. We perform these limit increases on a regular basis. We don't publish the increase amount or the frequency with which these increases occur, because these values can change regularly.

You can see the current sending limits for your account on the Sending Statistics page in the Amazon SES console, or by using the GetSendQuota API.

If you need to have your sending limits by a larger amount, open a sending limit increase case in Support Center.

Message Limits

Limit Description

Maximum message size (including attachments)

10 MB per message (after base64 encoding).

Accepted header fields

Amazon SES accepts any email headers that follow the format described in RFC 822.

Accepted attachment types

Amazon SES accepts all file attachment types except for attachments with file extensions listed in Appendix: Unsupported Attachment Types.

Sender and Recipient Limits

Limit Description

Sender address

Both in and out of the sandbox, you are required to verify the "From", "Source", "Sender", and "Return-Path" email addresses or domains, although not "Reply-To".

Recipient address

In the sandbox environment, all "To" addresses except for Amazon SES mailbox simulator addresses must be verified. If you don't want to verify your "To" addresses, open an SES Sending Limit case in Support Center. For more information, see Moving Out of the Amazon SES Sandbox.

Maximum number of recipients per message

50 recipients per message.

A recipient is any "To", "CC", or "BCC" address.

Maximum number of identities you can verify

10,000 identities (domains or email addresses, in any combination) per AWS Region.

Limits Related to Email Sending Event Publishing

Limit Description

Maximum number of configuration sets


Maximum length of configuration set name

Configuration set names can contain up to 64 alphanumeric characters. They can also contain hyphens (-) and underscores (_). Names can't contain spaces, accented characters, or any other special characters.

Maximum number of event destinations per configuration set


Maximum number of dimensions per CloudWatch event destination


Email Template Limits

Limit Description

Maximum number of email templates in each AWS Region


Maximum template size

500 KB

Maximum number replacement values in each template


Maximum number of recipients for each templated email

50 destinations. A destination is any email address on the "To", "CC", or "BCC" lines.


The number of destinations you can contact in a single call to the API may be limited by your account’s maximum sending rate.

Amazon EC2-Related Limits

Limit Description

Email sending over port 25

Amazon EC2 throttles email traffic over port 25 by default. To avoid timeouts when sending email through the Amazon SES SMTP endpoint from Amazon EC2, use a different port (587 or 2587) or fill out a Request to Remove Email Sending Limitations.

Limits Related to Email Receiving

The following table lists limits related to email receiving.

Limit Description

Maximum number of rules per receipt rule set


Maximum number of actions per receipt rule


Maximum number of recipients per receipt rule


Maximum number of receipt rule sets per AWS account


Maximum number of IP address filters per AWS account


Maximum email size (including headers) that can be stored in an Amazon S3 bucket

30 MB

Maximum email size (including headers) that can be published using an Amazon SNS notification

150 KB

General Limits

The following table lists limits that apply to both email sending and email receiving.

Amazon SES API Limits

Limit Description

Rate at which you can call Amazon SES API actions

All actions (except for SendEmail and SendRawEmail) are throttled at one request per second. For more information about the Amazon SES API, see the Amazon Simple Email Service API Reference.

For information and discussions about a variety of topics related to Amazon SES, see the AWS Messaging and Targeting Blog. To browse and post questions, go to the Amazon SES Forum.