Style Tag in HTML Email

If I add a style tag to a campaign template it works fine. If I add a style tag to the welcome email content it gets stripped out and the styles display as plain text. I would like to be able to add html and a style tag to the notification emails. I believe the code is stripped out and auto formatted with paragraph tags due to the following:

public function get_welcome_email_content() {
return wpautop( stripslashes( get_option( ‘ig_es_welcome_email_content’, ” ) ) );
}

Can a style tag be supported in the notification email settings? and can automatic formatting with p tags be optional? Without being able to add tags like style and mso conditionals (for outlook) the email html options are limited.