diff --git a/roles/vim.nix b/roles/vim.nix
index e229b5d..9c8be10 100644
--- a/roles/vim.nix
+++ b/roles/vim.nix
@@ -153,12 +153,12 @@ vim_configurable.customize {
     function! MuttSettings()
         set textwidth=79
         set spell spelllang=en_au
-        "set tabstop=4
-        "set shiftwidth=4
-        "set expandtab
+        hi clear SpellBad             " Clear any unwanted default settings
+        hi SpellBad cterm=underline   " Set the spell checking highlight style
+        hi SpellBad ctermbg=NONE      " Set the spell checking highlight background
     endfunction
-    autocmd BufNewFile,BufFilePre,BufRead /tmp/mutt-* :call MuttSettings()
-    autocmd BufNewFile,BufFilePre,BufRead /tmp/neomutt-* :call MuttSettings()
+    autocmd BufNewFile,BufFilePre,BufRead mutt-* :call MuttSettings()
+    autocmd BufNewFile,BufFilePre,BufRead neomutt-* :call MuttSettings()
 
     " Settings for my C environment:
     function! CSettings()