You can clone with
This is something the user should do either by himself or make it as a option...
This happens if you have some special characters (like in german)
ö -> "ö ;"
Some Email Clients does not read it correctly when I tested it.
I've faced similar problem. It described here http://stackoverflow.com/q/11477739/1009697. Moving to actionmailer_inline_css gem resolved my issue.