iequidoo

The `image` crate used by Core doesn't support HEIF, so the first problem is that we can't recode it to reduce its size as for other formats. The second one...

Are renamed files with changed extensions a frequent problem? Even if we use this `infer` crate, Core may return a wrong mimetype for attachments in received messages because it prefers...

> i think for security and performance reasons, the sender must encode the image into jpg unless its send as a raw file. there are no decent heif implementations and...

We already have image format guessing in Core's `BlobObject::recode_to_size()`, but if it fails, it just proceeds with the original "image". In fact we don't know if it's an image then,...

https://github.com/chatmail/core/pull/6904 is merged, so now unrecognized images are sent as `File`s, they are only renamed to "image_DATETIME.EXT" to not reveal the original file name. If such an image contains Exif,...