使用smtpClient发送邮件时

author:oiea  From:博客园
使用smtpClient发送邮件时，经常跑出难以明白的错误。其实主要都和我们申请的免费邮箱有关系。有些邮箱不支持，比如163的以前申请的帐号可以用，新注册的帐号是发不了的。

  /**//// <summary>
    /// 功能：发送邮件,返回字符串：“发送成功”否则返回错误代码。
    /// 创建：2007-08-23
    /// </summary>
    /// <param name="MailTo">MailTo为收信人地址</param>
    /// <param name="Subject">Subject为标题</param>
    /// <param name="Body">Body为信件内容</param>
    /// <param name="BodyFormat">BodyFormat为信件内容格式:0为Text,1为Html</param>
    /// <param name="Priority">Priority为优先级:0为低,1为中,2为高</param>
    /// <param name="Attachments">Attachment为附件,为null则不发送</param>
    public static string SendMail(System.Collections.ArrayList MailTo, string Subject, string Body, int BodyFormat, int Priority, string Attachments)
    {
        string result;

 

        SmtpClient mail = new SmtpClient();
        //发送方式
        mail.DeliveryMethod = SmtpDeliveryMethod.Network;
        //smtp服务器
        mail.Host = "smtp.sina.com";
        //用户名凭证              
        mail.Credentials = new System.Net.NetworkCredential("mail_user_name", "mail_user_password");
        //邮件信息
        MailMessage message = new MailMessage();
        //发件人
        message.From = new MailAddress("mail_user_name@sina.com");   
        //收件人
        foreach (object item in MailTo)
        {
            message.To.Add(item.ToString());
        }
        //主题
        message.Subject = Subject;
        //内容
        message.Body = Body;
        //正文编码
        message.BodyEncoding = System.Text.Encoding.UTF8;
        //设置为HTML格式
        message.IsBodyHtml = true;
        //优先级
        message.Priority = MailPriority.High;

        try
        {
            mail.Send(message);
            result = "发送成功";
            return result;
        }
        catch (Exception e)
        {
            result = e.ToString();
        }
        return result;
    }

不同的邮箱，要改的部分主要是“上面代码中高亮的部分”，有些邮箱地址是要加后缀“@xxx.com”，而有些邮箱只要用户名就好了 .

 

附带以前2003版的：

        /**//// <summary>
        /// 发送邮件
        /// </summary>
        /// <param name="Sender">发件人邮箱地址</param>
        /// <param name="Receiver">收件人邮箱地址</param>
        /// <param name="Title">邮件标题</param>
        /// <param name="Content">邮件内容</param>
        /// <param name="SmtpServer">邮箱服务器名称</param>
        /// <param name="Validate">服务器是否需要验证</param>
        /// <param name="UserName">验证用户名</param>
        /// <param name="Password">验证密码</param>
        /// <returns>结果</returns>
        public string SendMail(string from,string to,string title,string body,string enclosure,
                                    string smtpServer,bool validate,string userName,string password)
        {
            MailMessage mail = new MailMessage();//实例化MailMessage
            mail.From = from; //邮件发件人
            mail.To = to;//邮件收件人
            mail.Subject = title;//邮件标题
            mail.Body = body; //邮件内容
            mail.BodyFormat = MailFormat.Html; //邮件文本格式
            mail.Priority = MailPriority.Normal;//邮件发送级别
            if(enclosure != "")
            {
                //添加附件
                MailAttachment ma = new MailAttachment(enclosure);
                mail.Attachments.Add(ma);
            }
            //邮件服务器是否需要验证
            if(validate)
            {
                if(userName != "" && password != "")
                {
                    mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1"); 
                    mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", userName);
                    mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", password);
                }
                else
                {
                    return "缺少验证用户名和密码";
                }
            }
            try
            {
                SmtpMail.SmtpServer = smtpServer;//设置邮件服务器
   
                //发送邮件
                SmtpMail.Send(mail);
                return "邮件发送成功！";
            }
            catch
            {
                return "邮件发送失败！";
            }
        }