new file mode 100644
--- /dev/null
+++ b/runtime/syntax/sieve.vim
@@ -0,0 +1,70 @@
+" Vim syntax file
+" Maintainer:	    Nikolai Weibull <source@pcppopper.org>
+" URL:		    http://www.pcppopper.org/
+" Latest Revision:  2004-11-11
+" arch-tag:	    356fad6d-ff6b-453c-bd25-7fc63c4758bc
+
+if version < 600
+  syntax clear
+elseif exists("b:current_syntax")
+  finish
+endif
+
+" Todo
+syn keyword sieveTodo	  contained TODO FIXME XXX NOTE
+
+" Comments
+syn region  sieveComment  matchgroup=sieveComment start='/\*' end='\*/' contains=sieveTodo
+syn region  sieveComment  matchgroup=sieveComment start='#' end='$' contains=sieveTodo
+
+syn case ignore
+
+" Tags
+syn match   sieveTag	  ':\h\w*'
+
+" Numbers
+syn match   sieveNumber	  '\d\+[KMG]\='
+
+" Specials
+syn match   sieveSpecial  '\\["\\]'
+
+" Strings
+syn region  sieveString	  matchgroup=sieveString start=+"+ skip=+\\\\\|\\"+ end=+"+ contains=sieveSpecial
+syn region  sieveString	  matchgroup=sieveString start='text:' end='\n.\n'
+
+" Keywords
+syn keyword sieveConditional  if elsif else
+syn keyword sieveTest	      address allof anyof envelope exists false header not size true
+syn keyword sievePreProc      require stop
+syn keyword sieveAction	      reject fileinto redirect keep discard
+syn match   sieveKeyword      '\<\h\w*\>'
+
+" Define the default highlighting.
+" For version 5.7 and earlier: only when not done already
+" For version 5.8 and later: only when an item doesn't have highlighting yet
+if version >= 508 || !exists("did_sieve_syn_inits")
+  if version < 508
+    let did_sieve_syn_inits = 1
+    command -nargs=+ HiLink hi link <args>
+  else
+    command -nargs=+ HiLink hi def link <args>
+  endif
+
+  HiLink sieveTodo	  Todo
+  HiLink sieveComment	  Comment
+  HiLink sieveTag	  Type
+  HiLink sieveNumber	  Number
+  HiLink sieveSpecial	  Special
+  HiLink sieveString	  String
+  HiLink sieveConditional Conditional
+  HiLink sieveTest	  Keyword
+  HiLink sievePreProc	  PreProc
+  HiLink sieveAction	  Keyword
+  HiLink sieveKeyword	  Keyword
+
+  delcommand HiLink
+endif
+
+let b:current_syntax = "sieve"
+
+" vim: set sts=2 sw=2: