using System;  

using System.Net;  

using System.Net.Mail;  

using System.Net.Mime;  

namespace Fish 

{  

    /**//// <summary>  

    /// 发送邮件的类  

    /// </summary>  

    public class SendMail  

    {  

        private MailMessage mailMessage;  

        private SmtpClient smtpClient;  

        private string password;//发件人密码  

        /**//// <summary>  

        /// 处审核后类的实例  

        /// </summary>  

        /// <param name="To">收件人地址</param>  

        /// <param name="From">发件人地址</param>  

        /// <param name="Body">邮件正文</param>  

        /// <param name="Title">邮件的主题</param>  

        /// <param name="Password">发件人密码</param>  

        public SendMail(string To, string From, string Body, string Title, string 

Password)  

        {  

            mailMessage = new MailMessage();  

            mailMessage.To.Add(To);  

            mailMessage.From = new System.Net.Mail.MailAddress(From);  

            mailMessage.Subject = Title;  

            mailMessage.Body = Body;  

            mailMessage.IsBodyHtml = true;  

            mailMessage.BodyEncoding = System.Text.Encoding.UTF8;  

            mailMessage.Priority = System.Net.Mail.MailPriority.Normal;  

            this.password = Password;  

        }  

        /**//// <summary>  

        /// 添加附件  

        /// </summary>  

        public void Attachments(string Path)  

        {  

            string[] path = Path.Split("","");  

            Attachment data;  

            ContentDisposition disposition;  

            for (int i = 0; i < path.Length; i++)  

            {  

                data = new Attachment(path[i], MediaTypeNames.Application.Octet);//实例化 

附件  

                disposition = data.ContentDisposition;  

                disposition.CreationDate = System.IO.File.GetCreationTime(path[i]);//获取 

附件的创建日期  

                disposition.ModificationDate = System.IO.File.GetLastWriteTime(path[i]);// 

获取附件的修改日期  

                disposition.ReadDate = System.IO.File.GetLastAccessTime(path[i]);//获取附 

件的读取日期  

                mailMessage.Attachments.Add(data);//添加到附件中  

            }  

        }  

        /**//// <summary>  

        /// 异步发送邮件  

        /// </summary>  

        /// <param name="CompletedMethod"></param>  

        public void SendAsync(SendCompletedEventHandler CompletedMethod)  

        {  

            if (mailMessage != null)  

            {  

                smtpClient = new SmtpClient();  

                smtpClient.Credentials = new System.Net.NetworkCredential 

(mailMessage.From.Address, password);//设置发件人身份的票据  

                smtpClient.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;  

                smtpClient.Host = "smtp." + mailMessage.From.Host;  

                smtpClient.SendCompleted += new SendCompletedEventHandler 

(CompletedMethod);//注册异步发送邮件完成时的事件  

                smtpClient.SendAsync(mailMessage, mailMessage.Body);  

            }  

        }  

        /**//// <summary>  

        /// 发送邮件  

        /// </summary>  

        public void Send()  

        {  

            if (mailMessage != null)  

            {  

                smtpClient = new SmtpClient();  

                smtpClient.Credentials = new System.Net.NetworkCredential 

(mailMessage.From.Address, password);//设置发件人身份的票据  

                smtpClient.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;  

                smtpClient.Host = "smtp." + mailMessage.From.Host;  

                smtpClient.Send(mailMessage);  

            }  

        }  

    }  

}

这段代码，觉得用起来还行，我在服务器上死活不行，发送失败，提示不允许使用邮箱名，然后百度了一大圈，看了各种资料，尝试了各种办法就是不行，哪位大侠可以告诉我这是为什么！