diff --git a/runtime/syntax/sm.vim b/runtime/syntax/sm.vim
new file mode 100644
index 0000000..f919d87
--- /dev/null
+++ b/runtime/syntax/sm.vim
@@ -0,0 +1,96 @@
+" Vim syntax file
+" Language:	sendmail
+" Maintainer:	Dr. Charles E. Campbell, Jr. <NdrOchipS@PcampbellAfamily.Mbiz>
+" Last Change:	Sep 02, 2003
+" Version:	3
+" URL:	http://www.erols.com/astronaut/vim/index.html#vimlinks_syntax
+
+" For version 5.x: Clear all syntax items
+" For version 6.x: Quit when a syntax file was already loaded
+if version < 600
+  syntax clear
+elseif exists("b:current_syntax")
+  finish
+endif
+
+" Comments
+syn match smComment	"^#.*$"	contains=@Spell
+
+" Definitions, Classes, Files, Options, Precedence, Trusted Users, Mailers
+syn match smDefine	"^[CDF]."
+syn match smDefine	"^O[AaBcdDeFfgHiLmNoQqrSsTtuvxXyYzZ]"
+syn match smDefine	"^O\s"he=e-1
+syn match smDefine	"^M[a-zA-Z0-9]\+,"he=e-1
+syn match smDefine	"^T"	nextgroup=smTrusted
+syn match smDefine	"^P"	nextgroup=smMesg
+syn match smTrusted	"\S\+$"		contained
+syn match smMesg		"\S*="he=e-1	contained nextgroup=smPrecedence
+syn match smPrecedence	"-\=[0-9]\+"		contained
+
+" Header Format  H?list-of-mailer-flags?name: format
+syn match smHeaderSep contained "[?:]"
+syn match smHeader	"^H\(?[a-zA-Z]\+?\)\=[-a-zA-Z_]\+:" contains=smHeaderSep
+
+" Variables
+syn match smVar		"\$[a-z\.\|]"
+
+" Rulesets
+syn match smRuleset	"^S\d*"
+
+" Rewriting Rules
+syn match smRewrite	"^R"			skipwhite nextgroup=smRewriteLhsToken,smRewriteLhsUser
+
+syn match smRewriteLhsUser	contained "[^\t$]\+"		skipwhite nextgroup=smRewriteLhsToken,smRewriteLhsSep
+syn match smRewriteLhsToken	contained "\(\$[-*+]\|\$[-=][A-Za-z]\|\$Y\)\+"	skipwhite nextgroup=smRewriteLhsUser,smRewriteLhsSep
+
+syn match smRewriteLhsSep	contained "\t\+"			skipwhite nextgroup=smRewriteRhsToken,smRewriteRhsUser
+
+syn match smRewriteRhsUser	contained "[^\t$]\+"		skipwhite nextgroup=smRewriteRhsToken,smRewriteRhsSep
+syn match smRewriteRhsToken	contained "\(\$\d\|\$>\d\|\$#\|\$@\|\$:[-_a-zA-Z]\+\|\$[[\]]\|\$@\|\$:\|\$[A-Za-z]\)\+" skipwhite nextgroup=smRewriteRhsUser,smRewriteRhsSep
+
+syn match smRewriteRhsSep	contained "\t\+"			skipwhite nextgroup=smRewriteComment,smRewriteRhsSep
+syn match smRewriteRhsSep	contained "$"
+
+syn match smRewriteComment	contained "[^\t$]*$"
+
+" Clauses
+syn match smClauseError		"\$\."
+syn match smElse		contained	"\$|"
+syn match smClauseCont	contained	"^\t"
+syn region smClause	matchgroup=Delimiter start="\$?." matchgroup=Delimiter end="\$\." contains=smElse,smClause,smVar,smClauseCont
+
+" 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_smil_syntax_inits")
+  if version < 508
+    let did_smil_syntax_inits = 1
+    command -nargs=+ HiLink hi link <args>
+  else
+    command -nargs=+ HiLink hi def link <args>
+  endif
+
+  HiLink smClause	Special
+  HiLink smClauseError	Error
+  HiLink smComment	Comment
+  HiLink smDefine	Statement
+  HiLink smElse		Delimiter
+  HiLink smHeader	Statement
+  HiLink smHeaderSep	String
+  HiLink smMesg		Special
+  HiLink smPrecedence	Number
+  HiLink smRewrite	Statement
+  HiLink smRewriteComment	Comment
+  HiLink smRewriteLhsToken	String
+  HiLink smRewriteLhsUser	Statement
+  HiLink smRewriteRhsToken	String
+  HiLink smRuleset	Preproc
+  HiLink smTrusted	Special
+  HiLink smVar		String
+
+  delcommand HiLink
+endif
+
+let b:current_syntax = "sm"
+
+" vim: ts=18