I\'ve problem with sending HTML mails with PHPMailer. I make a Smarty template and I got all the HTML code from it. But when I send mail, I got the mail without included CSS
CSS support in e-mail is very limited, at least. The biggest issue is that different clients support different sets of CSS-properties.
You provide very little context for us to work with.
For more information on CSS support in e-mail, please refer to this excellent overview.