Can we store old emails from another server on AWS S3 for later access

Yes, it is possible to store old emails from another email service provider on AWS S3 for later access.

One way to do so is to export the emails from the existing email service provider and save them as individual files on a local computer. Then, these files can be uploaded to an S3 bucket using the AWS Management Console or the AWS CLI. Once the emails are uploaded, they can be accessed and searched as needed using an S3 client or other tools.

Another way to do this is to use a third-party tool that can directly export emails from the existing email service provider to AWS S3. Many email archiving and backup solutions support exporting emails to AWS S3, including Barracuda Message Archiver, ArcTitan, and others. These tools can often be configured to automatically export emails to S3 on a regular basis, and can provide additional features such as indexing and searching of the archived emails.

In regards to the cost, AWS S3 pricing is based on the amount of data stored and data transfer out of S3. You can check the S3 pricing page on the AWS website for more information on the cost of storing and accessing data in S3. The cost of the third-party tools mentioned above will vary depending on the specific tool and its features. You should evaluate your options carefully to choose a solution that meets your client's needs and budget.