Vim chokes on mail.vim ftplugin function

I'm using Vim 7.3 from ports on FreeBSD. When mutt loads the editor it
throws the following error:

Error detected while processing
/usr/local/share/vim/vim73/ftplugin/mail.vim:
line 54:
:%s/^>[[:space:]%|#>]\+$//e
:%s/^>[[:space:]%|#>]\+$//e

Here's the function from the stock mail.vim ftplugin:

function! Mail_Del_Empty_Quoted()
exe "normal :%s/^>[[:space:]\%\|\#>]\\+$//e\<CR>"
endfunction

call Mail_Del_Empty_Quoted()

Thanks,

Jorge Luis

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Jorge Luis González <list+vim@jorge.cc>
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