THEME_preprocess_field() not recognised in template.php I'm using Drupal Bootstrap. Mail (password reset, user blocked etc..) from admin sends messages without preserving line breaks.

I tried this to fix this issue, but THEME_preprocess_field(&amp;$vars, $hook) doesn't work for me.
Try with THEME_preprocess_field(&amp;$variables, $hook), replace the &amp;$vars with &amp;$variables