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Amazon WorkMail Limits

Amazon WorkMail can be used by enterprise customers as well as small business owners. Although we support most use cases without the need to configure any changes in limits, we also protect our users and the internet against abuse of the product. Therefore, some customers may run into limits that we have set. This section describes these limits and how to change them.

Some limit values can be changed, and some are hard limits that cannot be changed. If you want to change a limit value for Amazon WorkMail, follow these steps to submit a limit increase request:

1. Go to the AWS Support Center, sign in if prompted, and then choose Create Case.

2. Under Regarding, choose Service Limit Increase.

3. Under Limit Type, choose the type of limit to increase, fill in the necessary form fields, and then choose your preferred method of contact.

4. If you are requesting a limit increase for a specific organization, enter the Organization Alias.

5. Wait up to five working days for increases to become effective.

Note

It is possible to request a limit increase regardless of the age of the account. When you create a new AWS account, the values you are subjected to are usually lower than those for veteran accounts. On this page, only the default limit values for veteran accounts are listed.

Amazon WorkMail Organization and User Limits

You can add up to 25 users for a 30-day free trial. After this period ends, you are charged for all active users unless you remove them or close your Amazon WorkMail account.

All messages that are sent to another user are considered when evaluating these limits. These include emails, meeting requests, meeting responses, task requests, and messages that are forwarded or redirected automatically as the result of a rule.

Note

When requesting a limit increase request only for a specific organization, include the organization name in your request.

Resource	Default Limit	Upper Bound for Change Requests
Users per Amazon WorkMail organization	1,000	Can be increased depending on the directory type that is used for the organization: Amazon WorkMail directory: up to 10 million users Simple AD or AD Connector, large: up to 5,000 users* Simple AD or AD Connector, small: up to 500 users* Microsoft AD, hosted by AWS Directory Service: depending on your set-up and configuration, up to 10 million users *If you are using Simple AD or AD Connector, see AWS Directory Service for additional information.
Free trial users	Up to 25 users in the first 30 days	The free trial period is only applicable for the first 25 users in any organization. Any additional users are not included in the free trial offer.
Recipients addressed per AWS account per day	100,000 recipients external to the organization, with no hard limit on recipients internal to the organization	There is no upper bound. However, Amazon WorkMail is a business email service and not intended to be used for bulk email services. For bulk email services, see Amazon SES or Amazon Pinpoint.
Recipients addressed per AWS account per day using any of the test domains	200 recipients, regardless of destination	There is no upper bound. However, the test mail domain is not intended for long-term usage. Instead, we recommend that you add your own domain and use it as the default domain.

Limits on groups are set by the underlying directory.

WorkMail Organization Setting Limits

Resource	Default Limit
Number of domains per Amazon WorkMail organization	1,000 This is a hard limit and cannot be changed.
Number of sender patterns in email flow rules per rule	250 This is a hard limit and cannot be changed.
Number of sender patterns in email flow rules per organization	1,000 This is a hard limit and cannot be changed.

Per-User Limits

All messages that are sent to another user are considered when evaluating these limits. These include emails, meeting requests, meeting responses, task requests, and messages that are forwarded or redirected automatically as the result of a rule.

Resource	Default Limit	Upper Limit for Change Requests
Maximum size of mailbox	50 GB	50 GB
Maximum number of aliases per user	100 This is a hard limit and cannot be changed.	N/A
Recipients addressed per user per day using the domain that you own	10,000 recipients external to the organization, with no hard limit on recipients internal to the organization.	There is no upper bound. However, Amazon WorkMail is a business email service and not intended to be used for bulk email services. For bulk email services, see Amazon SES or Amazon Pinpoint.

Message Limits

All messages that are sent to another user are considered when evaluating these limits. These include emails, meeting requests, meeting responses, task requests, and messages that are forwarded or redirected automatically as the result of a rule.

Resource	Default Limit
Maximum size of incoming message	25 MB This is a hard limit and cannot be changed.
Maximum size of outgoing message	25 MB This is a hard limit and cannot be changed.
Number of recipients per message	500 This is a hard limit and cannot be changed.