Any possibilities of enabling attachments for transactional emails? Currently all attachments are stripped off automatically if you try to send transactional emails via SMTP relay. This doesn't help in situations like sending payment confirmation emails with the receipt as PDF attachments. This is just one example. I understand adding attachment support may introduce other challenges and caveats for server where ED is installed, specifically running out of storage. And a novoice user might not be able to troubleshoot it. But, probably you can add this as an optional feature, wherein let the server admins decide if they want to enable it or not. Easiest thing I can think of is enabling it by adding a variable in the docker file. Also, may be a cronjob to delete the old attachments and temp files stored on the server. And if adding this feature through admin panel, may be you add relevant warnings about the side effects and let the admin decide if they still want to enable it or not.
