Mew is a very flexible mail reader for Emacs. It supports ssh. You need to be a Meta-ARPA member. For sdfeu proceed as follows:

  - Set up ssh public key authentication on a port with Meta-ARPA features (465, 587, 995, 996 1025, 8080 or 7070)
  - Edit your .mew.el file: 

     (setq mew-config-alist 
         '((sdfeu
           (inbox-folder     "+sdfeu-inbox")
           (user           "USERNAME")
           (mail-domain    "sdfeu.org")
           (pop-ssh-server  "USERNAME@sdfeu.org")
           (pop-user       "USERNAME")
           (pop-auth pass)
           (smtp-ssh-server    "USERNAME@sdfeu.org")
           (use-smtp-auth nil))
          )
     )