public MailContent text(String s) {
        html.a(escapeXml(s));
        text.a(s);
        return this;
    }
public MailContent text ( String s ) { html . a ( escapeXml ( s ) ) ; text . a ( s ) ; return this ; }
Adds text to both the HTML and the plain text version. The HTML version
is escaped of all XML tags.

@param s the text to append
@return the changed mail content object