No From values in folder export CSV

When selecting messages in message list in a mail folder, then right click and choosing Export List and then CSV, the resulting CSV has a “From” column, but the values in the column are blank.

This is because you are using conversation view, so the list is not a list of messages, but conversations. It is not possible to give a from address for a conversation because there are many.

If you disable conversations in Menu > View > Conversations, the export will include the from address as well as other fields that are not possible with conversations, such as read/unread status.