--- a/runtime/syntax/mail.vim
+++ b/runtime/syntax/mail.vim
@@ -23,17 +23,17 @@ syn case match
 " For "From " matching case is required. The "From " is not matched in quoted
 " emails
 syn region	mailHeader	contains=@mailHeaderFields start="^From " skip="^\s" end="\v^[-A-Za-z0-9]*([^-A-Za-z0-9:]|$)"me=s-1
-syn match	mailHeaderKey	contained contains=mailEmail "^From\s.*$"
+syn match	mailHeaderKey	contained contains=mailEmail,@NoSpell "^From\s.*$"
 
 syn case ignore
 " Nothing else depends on case. Headers in properly quoted (with "> " or ">")
 " emails are matched
-syn region	mailHeader	keepend contains=@mailHeaderFields,@mailQuoteExps start="^\z(\(> \?\)*\)\v(newsgroups|from|((in-)?reply-)?to|b?cc|subject|return-path|received|date|replied):" skip="^\z1\s" end="\v^\z1[-a-z0-9]*([^-a-z0-9:]|$)"me=s-1 end="\v^\z1@!"me=s-1 end="\v^\z1(\> ?)+"me=s-1
+syn region	mailHeader	keepend contains=@mailHeaderFields,@mailQuoteExps,@NoSpell start="^\z(\(> \?\)*\)\v(newsgroups|from|((in-)?reply-)?to|b?cc|subject|return-path|received|date|replied):" skip="^\z1\s" end="\v^\z1[-a-z0-9]*([^-a-z0-9:]|$)"me=s-1 end="\v^\z1@!"me=s-1 end="\v^\z1(\> ?)+"me=s-1
 
-syn region	mailHeaderKey	contained contains=mailHeaderEmail,mailEmail,@mailQuoteExps start="\v(^(\> ?)*)@<=(to|b?cc):" skip=",$" end="$"
-syn match	mailHeaderKey	contained contains=mailHeaderEmail,mailEmail "\v(^(\> ?)*)@<=(from|reply-to):.*$"
+syn region	mailHeaderKey	contained contains=mailHeaderEmail,mailEmail,@mailQuoteExps,@NoSpell start="\v(^(\> ?)*)@<=(to|b?cc):" skip=",$" end="$"
+syn match	mailHeaderKey	contained contains=mailHeaderEmail,mailEmail,@NoSpell "\v(^(\> ?)*)@<=(from|reply-to):.*$"
 syn match	mailHeaderKey	contained "\v(^(\> ?)*)@<=date:"
-syn match	mailSubject	contained "\v(^(\> ?)*)@<=subject:.*$" contains=@Spell
+syn match	mailSubject	contained "\v(^(\> ?)*)@<=subject:.*$"
 
 " Anything in the header between < and > is an email address
 syn match	mailHeaderEmail	contained "<.\{-}>"