1 - automatic linking
2 
3   would be nice to transform the URLs in the mail' body into clickable
4   links.  Additionally, it would be nice to support the [n] reference
5   syntax.  Maybe turning also commit ids into links?
6 
7 
8 - improve thread navigation
9 
10   find a way to show links to previous/next messages in thread.  (yes,
11   *messages* since threads are trees there may be multiple next
12   messages)
13 
14 
15 - show the original file name in the list of attachments.
16 
17   see for e.g. /mail/YSqwKz9bbMYM9fHW@benson.stsp.name.html