Understanding Amazon S3

Amazon Simple Storage Service (S3) is a scalable object storage service that allows developers to store and retrieve any amount of data at any time, from anywhere on the web. It is designed to make web-scale computing easier for developers by providing a simple web services interface to store and retrieve data.

Identifying the Symptom

When working with S3, you might encounter the UnresolvableGrantByEmailAddress error. This error typically occurs when you attempt to set permissions on an S3 bucket using an email address that cannot be resolved to a valid AWS account.

What You Observe

While setting bucket policies or access control lists (ACLs), you may receive an error message indicating that the grant by email address is unresolvable. This prevents you from successfully applying the intended permissions.

Explaining the Issue

The UnresolvableGrantByEmailAddress error arises because the email address specified does not correspond to any existing AWS account. S3 requires that email addresses used in grants be associated with valid AWS accounts to ensure proper permission management.

Why This Happens

This issue often occurs due to typographical errors in the email address, the use of outdated email addresses, or attempting to use an email address that has not been registered with AWS.

Steps to Resolve the Issue

To resolve the UnresolvableGrantByEmailAddress error, follow these steps:

Step 1: Verify the Email Address

• Double-check the email address for any typos or errors.
• Ensure that the email address is current and associated with an active AWS account.

Step 2: Confirm AWS Account Association

• Contact the owner of the email address to confirm that it is linked to an AWS account.
• Request the AWS account ID if necessary, as this can be used as an alternative to email addresses in grants.

Step 3: Use AWS Account ID Instead

If the email address cannot be resolved, consider using the AWS account ID for granting permissions. This can be more reliable as it directly references the account.

{
"Grantee": {
"ID": ""
},
"Permission": "FULL_CONTROL"
}

Step 4: Update the Bucket Policy or ACL

Once you have verified the correct information, update your bucket policy or ACL with the correct identifiers. Refer to the AWS S3 ACL Overview for more details on setting permissions.

Additional Resources

For more information on managing permissions in S3, you can visit the following resources:

• Using AWS Identity and Access Management with S3
• Amazon S3 FAQs