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public void send(MailMsg msg, string[] attachments)
    {
        putlog("send:1");
        MailMessage mail = new MailMessage();
        mail.To = msg.MailTo;
        mail.From = msg.MailFrom;

        mail.Subject = msg.MailSubject;
        mail.Body = msg.MailContent;
        mail.BodyFormat = MailFormat.Html;

        for (int i = 0; i < attachments.Length; i++)
        {
            putlog("send:1-" + (i + 1).ToString());
            if (attachments[i] != null && attachments[i].ToString() != "")
            {
                putlog("send:1-" + (i + 1).ToString() + "-1");
                MailAttachment attachment = new MailAttachment(attachments[i].ToString());
                mail.Attachments.Add(attachment);
            }
        }

        putlog("send:2");

        //basic authentication
        mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1");
        //set your username here
        mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", ConfigurationManager.AppSettings["UserName"]);
        //set your password here
        mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", ConfigurationManager.AppSettings["UserPwd"]);

        //ip of mail server
        SmtpMail.SmtpServer = ConfigurationManager.AppSettings["mailServerIP"]; //"10.25.100.21";  //your real server goes here
        SmtpMail.Send(mail);
    }