Authentication problem occurs while using SES

[hongbin-dramancompany]

unable to sign request without credentials set error message

Our system is config.action_mailer.delivery_method = :aws_sdk Aws::Rails.add_action_mailer_delivery_method() and is using sdk as an option.

When an error occurs, the system sends a large number of e-mails to up to N users asynchronous jobs. At this point, the above error message occurs (it works well in normal situatxions)

As far as I know, it occurs when the rate limit of authentication is exceeded. Other aws services made aws client singleton, so the problem has been solved. Is there any way to fix that?

---

• aws-sdk-rails (2.1.0)
• aws-sdk-ses (1.24.0)
• rails (6.1.7.5)

[alextwoods]

Sorry you are running into that - it does sound like potentially a throttling issue with retrieving credentials. Are you providing any client options? What type of credentials are you using? How are you running the async jobs?

[mullermp]

I agree with Alex that it's potentially a throttling issue with credentials. You should resolve credentials in your initializer and pass it into the add action mailer delivery method method.

I would also recommend updating your aws-sdk-rails and aws-sdk-ses.

# this would be :ses or :sesv2 in newer aws-sdk-rails versions
credentials = ... # Aws::InstanceProfileCredentials if Ec2, etc
Aws::Rails.add_action_mailer_delivery_method(:aws_sdk, { credentials: credentials, ... } )

[alextwoods]

Yeah, agree with @mullermp - the easiest way to fix this issue is to create the credentials outside of the delivery method in your initializer. This will ensure a single credentials object is created (and note: the refreshing of those credentials is thread safe).
We are looking at making the options for the mailer include client and defaulting to a single, shared instance of the client, but believe this would be a breaking change that we'd include in a new MV.

[mullermp]

Please re-open if there's still issue.