To read a file from Amazon S3 with the condition that the file starts with "email-," you can use the AWS SDK or command-line tools. Specifically, leverage the AWS SDK for the programming language of your choice (e.g., Boto3 for Python, AWS SDK for Java). Utilize the S3 API's list objects functionality with a prefix filter, specifying "email-" as the prefix. This will retrieve a list of objects meeting the specified condition, allowing you to read the desired file from Amazon S3 based on your criteria.