I hope to send a message to another,but as my try,

    SendMail[email, {subject, 
      "This is my <a href=\"http://www.wolfram.com\">url</a>."}]
Or

    SendMail[email, {subject, 
      Row[{"This is my ", Hyperlink["url", "http://www.wolfram.com"], 
        "."}]}]
will fail to do this.The message will be a attached files in the method.Any workaround can implement it?I hope the message include a hyperlink.