God damn.

4chan_x.user.js

@@ -630,7 +630,7 @@
     },
     email: function(root) {
       var mail;
-      if (!(mail = $('.linkmail', root))) return mail.href;
+      if (mail = $('.linkmail', root)) return mail.href;
       return false;
     },
     subject: function(root, isOP) {

changelog

@@ -3,6 +3,7 @@ master
 2.27.1
 - Mayhem
   Fix stubs with the new filter.
+  Fix mail filtering.
   The MD5 will now check for exact string matching, it will not use regular expressions.
 
 2.27.0

script.coffee

@@ -544,7 +544,7 @@ filter =
       return trip.textContent
     false
   email: (root) ->
-    unless mail = $ '.linkmail', root
+    if mail = $ '.linkmail', root
       return mail.href
     false
   subject: (root, isOP) ->