hi,
  i am facing a wierd problem.
in my application i have written a code to send mail with attachments.
problem is that sometimes the mail is sent and sometimes not.
i dont get any errors even when the mail is not sent.
it also happens that the same mail sent to 2-3 addresses is received on one address and not on others.
i dont know what is going wrong. what i feel is that if there is anything wrong with it should never send mail or to any address.
Is there any encoding of attachments to be done or so.
i am doing following things in my code:

    MailMessage myMailMsg = new MailMessage();
    myMailMsg.To = ToList;
    myMailMsg.From = mailid;
    myMailMsg.Cc = CcList;
        myMailMsg.Subject = subject;
    myMailMsg.Body = bodymsg;
    myMailMsg.BodyFormat = MailFormat.Html;

    SmtpMail.SmtpServer=smtpServer;

//the attachements are attached in a loop using the following code

MailAttachment MyAttachment = new MailAttachment(upfilepath);
myMailMsg.Attachments.Add(MyAttachment);

//And send the mail using

SmtpMail.Send(myMailMsg);

The values come properly in myMailMsg object. i checked it through debugging.

please help me out.
Regards,
Niks

This problem occurs when the CC is not separated by semicolon.While attachment there is no need of encoding.In debug mode u better see whether multiple addresses are separated by semicolon or not.

Regards
VijayKoneru