Über dieses Add-on
with autocomplete of folder names and rules for suggested folder.
Compose window: always display cc or bcc, easy selecting input fields (to, cc, bcc, body, attachments), etc.
Text insert++: Easy inserting standard text. br+ctrl-D converts to best regards. Define your own replacements.
Cursor can be in the middle of the replacement text.
Attachment image viewer: Download dialog shows thumbnail of image. Image viewer with zoom, rotate, flip, slideshow etc.
Xnote++: Add notes to your emails to remind or to plan a reply.