出现的问题：
这个问题
需要设置可以通过指定邮件服务器进行relay的ip地址
smtp->properties->access->relay
add the ip address
public bool Send(string to, string from, string subject, string message)
{
try
{
MailMessage em = new MailMessage();
em.To = to;
em.From = from;
em.Subject = subject;
em.Body = message;
//Found out how to send authenticated email via System.Web.Mail at http://SystemWebMail.com (fact 3.8)
if(this.UserName != null && this.Password != null)
{
em.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1"); //basic authentication
em.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", this.UserName); //set your username here
em.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", this.Password); //set your password here
}
SmtpMail.SmtpServer = this.SmtpServer;
SmtpMail.Send(em);
return true;
}
catch
{
return false;
}
}
}
}