遇到一个很奇怪的问题.

[xiangkunzhao]

我写了一个自动收费和自动发送E-mail的应用程序,点击那个exe文件,收费和发email都可以成功,我把这个应用程序放在sql作业下执行,只可以收费,E-mail发送不成功,请问怎么回事,请高手指点,谢谢!
发送E-mail的源带代码如下:

private static bool SendEmail(string ToEmail, string strSubject, string strBody)
{
SmtpClient smtpClient = new SmtpClient("Mail.yu-lian.com.cn");
smtpClient.UseDefaultCredentials = false;
smtpClient.Credentials = new System.Net.NetworkCredential("[e-mail]", "1");
smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
MailMessage message = new MailMessage("[e-mail]", ToEmail);
message.Subject = strSubject;
message.Body = strBody;// + "\r\n\r\n===================================================\r\n"
//+ txtQuestion.Text;
try
{
smtpClient.Send(message);
return true;
}
catch
{
return false;
}

}

[myminimouse]

不是很明白~