If you see the error message ‘invalid AWS secret access key,’ it means the key you are using in MailBluster Brand AWS Settings has been deleted or changed in the AWS console.
To resolve this, you need to create a new AWS access key and use it to connect to MailBluster. Navigate to your Brand > Settings > AWS page in MailBluster, where you will find the ‘AWS connection guide.’
Follow this AWS connection guide to reconnect your AWS account to MailBluster.