emacs-28 1dfe9d6: Recommend against using uce.el

[Stefan Kangas]

branch: emacs-28
commit 1dfe9d628535a4ba8fd902cad8563b5651c6ec36
Author: Stefan Kangas <stefan@marxist.se>
Commit: Stefan Kangas <stefan@marxist.se>

    Recommend against using uce.el
    
    * lisp/mail/uce.el: Recommend against its use.  (Bug#46472)
    Do not merge to master.
---
 lisp/mail/uce.el | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/lisp/mail/uce.el b/lisp/mail/uce.el
index b07004d..0a488e1 100644
--- a/lisp/mail/uce.el
+++ b/lisp/mail/uce.el
@@ -30,6 +30,27 @@
 ;; uce-reply-to-uce.  Please let me know about your changes so I can
 ;; incorporate them.  I'd appreciate it.
 
+;; -- !!! NOTE !!! ---------------------------------------------
+;;
+;; Replying to spam is at best pointless, but most likely actively
+;; harmful.
+;;
+;; - You will confirm that your email address is valid, thus ensuring
+;;   you get more spam.
+;;
+;; - You will leak information and open yourself up for further
+;;   attack.  For example, they could use your \"geolocation\" to find
+;;   your home address and phone number.
+;;
+;; - The sender address is likely fake.
+;;
+;; - You help them refine their methods of spamming.
+;;
+;; Therefore, we strongly recommend that you do not use this package.
+;; Use a spam filter instead, or just delete the spam.
+;;
+;; -------------------------------------------------------------
+
 ;; The command uce-reply-to-uce, if called when the current message
 ;; buffer is a UCE, will setup a reply *mail* buffer as follows.  It
 ;; scans the full headers of the message for: 1) the normal return