Block external images

[kornate]

I'm not too familiar with node.

Is there an easy way to block external images/not allow remote content in messages?

To avoid trackers and such, for privacy purposes, as is quite common in most mail clients.

[laurivosandi]

Third option is to have mailserver cache the images with corresponding User-Agent string and serve images from the cache. The canonical way to solve this is to have them placed in S3 bucket and have webmail serve digitally signed URL to fetch the images from the S3 bucket. For self-hosted setups there is Minio

If it's not much to ask can you try to implement a PR for this?