syntax case ignore
syntax match mailHeaderKey contained contains=mailHeaderEmail,mailEmail,@NoSpell "\v(^(\> ?)*)@<=(from|to|cc|delivered-to|reply-to|mail-followup-to|x-attribution):.*$"
syntax match mailSmile ' [;:]-*[dp(){}<>|\\/]\| [(){}<>\\/]-*[;:]' " :-)
syntax match mailURL contains=@NoSpell `\v<(((https?|ftp|gopher|telnet)://|(mailto|file|news|about|ed2k|irc|sip|magnet):)[^' \t<>"]+|(www|web|w3)[a-z0-9_-]*\.[a-z0-9._-]+\.[^' \t<>"]+)[a-z0-9/]`